Range of fixed-length integer generators differs from documentation

Nobody has claimed this yet.

## Description

The range of integers generated by fixed-length integer generators does not match the documentation, or an assertion error occurs. For example, `any.uint8` is supposed to generate integers ranging from 0 to 255 inclusive, but in reality, it generates integers ranging from 0 to 511 inclusive.

The affected generators include:

- `any.uint8`
- `any.uint16`
- `any.uint32`
- `any.int8`
- `any.int16`
- `any.int32`
- `any.int64` (causes an assertion error)

## Environment

- macOS 14.2.1
- Dart 3.2.6
- Glados 1.1.7

## Current behavior

- `any.uint8` generates integers from 0 (inclusive) to 512 (exclusive).
- `any.uint16` generates integers from 0 (inclusive) to 131072 (exclusive).
- `any.uint32` generates integers from 0 (inclusive) to 8589934592 (exclusive).
- `any.int8` generates integers from -256 (inclusive) to 256 (exclusive).
- `any.int16` generates integers from -65536 (inclusive) to 65536 (exclusive).
- `any.int32` generates integers from -4294967296 (inclusive) to 4294967296 (exclusive).
- `any.int64` is causing an assertion error.

The assertion error caused by using `any.int64` is as follows:

```
00:00 +0 -1: loading test/glados_report_test.dart [E]
Failed to load "test/glados_report_test.dart": 'package:glados/src/anys.dart': Failed assertion: line 27 pos 44: 'min < max': is not true.
dart:core _AssertionError._throwNew
package:glados/src/anys.dart 27:44 IntAnys.intInRange
package:glados/src/anys.dart 81:36 IntAnys.int64
test/glados_report_test.dart 30:14 main
```

## Expected behavior

The range of integers generated by the generators matches the documentation.

- `any.uint8` generates integers from 0 (inclusive) to 256 (exclusive).
- `any.uint16` generates integers from 0 (inclusive) to 65536 (exclusive).
- `any.uint32` generates integers from 0 (inclusive) to 4294967296 (exclusive).
- `any.int8` generates integers from -128 (inclusive) to 128 (exclusive).
- `any.int16` generates integers from -32768 (inclusive) to 32768 (exclusive).
- `any.int32` generates integers from -2147483648 (inclusive) to 2147483648 (exclusive).
- `any.int64` generates integers from -9223372036854775808 (inclusive) to 9223372036854775808 (exclusive).

The current implementation uses a bit shift of 2 where it should use a bit shift of 1. The assertion error when using `any.int64` occurs because the specified minimum value `-(2 << 63)` and the maximum value `2 << 63` both result in 0. Changing from a bit shift of 2 to a bit shift of 1 should fix the issue.

The current implementation is as follows:

https://github.com/MarcelGarus/glados/blob/d86f83ba0701bbed7ec39090f18e737a5893d305/glados/lib/src/anys.dart#L56C1-L81C68

```dart
/// A generator that returns [int]s between `0`, inclusive, to `256`, exclusive.
Generator get uint8 => intInRange(0, 2 << 8);

/// A generator that returns [int]s between `0`, inclusive, to `65536`,
/// exclusive.
Generator get uint16 => intInRange(0, 2 << 16);

/// A generator that returns [int]s between `0`, inclusive, to `4294967296`,
/// exclusive.
Generator get uint32 => intInRange(0, 2 << 32);

/// A generator that returns [int]s between `-128`, inclusive, to `128`,
/// exclusive.
Generator get int8 => intInRange(-(2 << 7), 2 << 7);

/// A generator that returns [int]s between `-32768`, inclusive, to `32768`,
/// exclusive.
Generator get int16 => intInRange(-(2 << 15), 2 << 15);

/// A generator that returns [int]s between `-2147483648`, inclusive, to
/// `2147483648`, exclusive.
Generator get int32 => intInRange(-(2 << 31), 2 << 31);

/// A generator that returns [int]s between `-9223372036854775808`, inclusive,
/// to `9223372036854775808`, exclusive.
Generator get int64 => intInRange(-(2 << 63), 2 << 63);
```

The tests are also implemented using the same bit shift expressions, so the tests need to be corrected as well.

https://github.com/MarcelGarus/glados/blob/d86f83ba0701bbed7ec39090f18e737a5893d305/glados/test/anys_test.dart#L39

```dart
Glados(any.uint8).test('uint8', (number) {
expect(number, greaterThanOrEqualTo(0));
expect(number, lessThan(2 << 8));
});
Glados(any.uint16).test('uint16', (number) {
expect(number, greaterThanOrEqualTo(0));
expect(number, lessThan(2 << 16));
});
Glados(any.uint32).test('uint32', (number) {
expect(number, greaterThanOrEqualTo(0));
expect(number, lessThan(2 << 32));
});
```

## Steps to reproduce

Unit tests verifying the range of integers generated by the generators are shown below.

```dart
import 'package:glados/glados.dart';

void main() {
Glados(any.uint8).test('uint8: 0 to 255', (value) {
expect(0 <= value && value <= 255, true);
});

Glados(any.uint16).test('uint16: 0 to 65535', (value) {
expect(0 <= value && value <= 65535, true);
});

Glados(any.uint32).test('uint32: 0 to 4294967294', (value) {
expect(0 <= value && value <= 4294967295, true);
});

Glados(any.int8).test('int8: -128 to 127', (value) {
expect(-128 <= value && value <= 127, true);
});

Glados(any.int16).test('int16: -32768 to 32767', (value) {
expect(-32768 <= value && value <= 32767, true);
});

Glados(any.int32).test('int32: -2147483648 to 2147483647', (value) {
expect(-2147483648 <= value && value <= 2147483647, true);
});

// This code will fail due to an assertion error
/*
Glados(any.int64).test('int64: -9223372036854775808 to 9223372036854775807',
(value) {
expect(-9223372036854775808 <= value && value <= 9223372036854775807, true);
});
*/
}
```

The test results are as follows:

```
% dart test --no-fail-fast
00:00 +0: loading test/glados_report_test.dart
intInRange(0, 0);
00:00 +0: test/glados_report_test.dart: uint8: 0 to 255 (testing 100 inputs)
Tested 2 inputs, shrunk 175 times.
Failing for input: 256
00:00 +0 -1: test/glados_report_test.dart: uint8: 0 to 255 (testing 100 inputs) [E]
Expected:
Actual:

package:matcher expect
test/glados_report_test.dart 7:5 main.
package:glados/src/glados.dart 178:28 Glados.test.

To run this test again: dart test test/glados_report_test.dart -p vm --plain-name 'uint8: 0 to 255 (testing 100 inputs)'
00:00 +0 -1: test/glados_report_test.dart: uint16: 0 to 65535 (testing 100 inputs)
Tested 2 inputs, shrunk 58799 times.
Failing for input: 65536
00:00 +0 -2: test/glados_report_test.dart: uint16: 0 to 65535 (testing 100 inputs) [E]
Expected:
Actual:

package:matcher expect
test/glados_report_test.dart 11:5 main.
package:glados/src/glados.dart 178:28 Glados.test.

To run this test again: dart test test/glados_report_test.dart -p vm --plain-name 'uint16: 0 to 65535 (testing 100 inputs)'
00:00 +1 -2: test/glados_report_test.dart: int8: -128 to 127 (testing 100 inputs)
Tested 1 input, shrunk 77 times.
Failing for input: -129
00:00 +1 -3: test/glados_report_test.dart: int8: -128 to 127 (testing 100 inputs) [E]
Expected:
Actual:

package:matcher expect
test/glados_report_test.dart 19:5 main.
package:glados/src/glados.dart 178:28 Glados.test.

To run this test again: dart test test/glados_report_test.dart -p vm --plain-name 'int8: -128 to 127 (testing 100 inputs)'
00:00 +1 -3: test/glados_report_test.dart: int16: -32768 to 32767 (testing 100 inputs)
Tested 2 inputs, shrunk 26031 times.
Failing for input: 32768
00:00 +1 -4: test/glados_report_test.dart: int16: -32768 to 32767 (testing 100 inputs) [E]
Expected:
Actual:

package:matcher expect
test/glados_report_test.dart 23:5 main.
package:glados/src/glados.dart 178:28 Glados.test.

To run this test again: dart test test/glados_report_test.dart -p vm --plain-name 'int16: -32768 to 32767 (testing 100 inputs)'
00:08 +1 -4: ... int32: -2147483648 to 2147483647 (testing 100 inputs)
63:09 +1 -4: test/glados_report_test.dart: int32: -2147483648 to 2147483647 (testing 100 inputs)
Tested 1 input, shrunk 2147483648 times.
Failing for input: -2147483649
63:09 +1 -5: test/glados_report_test.dart: int32: -2147483648 to 2147483647 (testing 100 inputs) [E]
Expected:
Actual:

package:matcher expect
test/glados_report_test.dart 27:5 main.
package:glados/src/glados.dart 178:28 Glados.test.

To run this test again: dart test test/glados_report_test.dart -p vm --plain-name 'int32: -2147483648 to 2147483647 (testing 100 inputs)'
63:09 +1 -5: Some tests failed.
```

Start in glados/lib/src/anys.dart, where the fixed-length integer generators and the int64 assertion are defined. Review the related range checks in test/anys_test.dart and run the Dart test suite. Done means all documented uint8–uint32 and int8–int64 ranges are enforced without the int64 assertion failure.

Written by the indexing model from the issue text.