client-v2: serializePrimitiveData rejects or silently corrupts String values for UInt64, UUID, Date and DateTime

## Summary

`SerializerUtils.serializePrimitiveData` accepts `String` input for most scalar column types via the `convertToInteger` / `convertToLong` / `convertToBigInteger` / `convertToBigDecimal` / `convertToString` helpers, but a subset of types either reject a `String` outright or — for `UInt64` — silently corrupt it. This makes String coercion inconsistent across the type switch.

Line references are against `0.9.5`, file `client-v2/src/main/java/com/clickhouse/client/api/data_formats/internal/SerializerUtils.java`.

## Behaviour today

| Column type | String input | Result |
|---|---|---|
| `Int8/16/32`, `UInt8/16`, `Int64`, `UInt32` | `convertToInteger` / `convertToLong` | works |
| `Int128/256`, `UInt128/256` | `convertToBigInteger` | works |
| `Decimal*` | `convertToBigDecimal` | works |
| `String`, `FixedString` | `convertToString` | works |
| **`UInt64`** (`:522`) | `convertToLong` → `Long.parseLong` (`:760`) | **throws above 2^63-1; silently wraps a negative** |
| **`UUID`** (`:575`) | `(UUID) value` | `ClassCastException` |
| **`Date`, `Date32`** (`:553`, `:556`) | `writeDate` / `writeDate32` (`:1105`) | `IllegalArgumentException: Cannot convert … to Long` |
| **`DateTime`, `DateTime64`** (`:559`, `:563`) | `writeDateTime` / `writeDateTime64` (`:1141`) | same |

### The `UInt64` case is a silent-corruption bug

```java
convertToLong("-1") // -> -1L (Long.parseLong, signed)
writeUnsignedInt64(-1L) // -> writeInt64 -> FF FF FF FF FF FF FF FF
```

ClickHouse reads that back as `18446744073709551615`. So a negative String is written as the maximum `UInt64` with no error.

This is already inconsistent within the library: `BinaryStreamUtils.writeUnsignedInt64(OutputStream, BigInteger)` range-checks via `ClickHouseChecker.between(value, TYPE_BIG_INTEGER, BigInteger.ZERO, U_INT64_MAX)`, so a `BigInteger` of `-1` is correctly rejected. Only the String path wraps.

Values in `[2^63, 2^64-1]` are legal `UInt64` values and are encodable on the wire (`writeUnsignedInt64(long)` just emits the raw 8 bytes), but unreachable through the String path.

## Proposed fix

1. **`UInt64`** — use an unsigned-aware conversion at `:522` rather than changing the shared `convertToLong`, which `Int64` (`:504`) and `UInt32` (`:519`) also use and which needs signed parsing:

```java
/** UInt64 runs past Long.MAX_VALUE; the returned long carries the raw bit pattern. */
public static Long convertToUnsignedLong(Object value) {
if (value instanceof String) {
return Long.parseUnsignedLong((String) value);
}
return convertToLong(value);
}
```

2. **`UUID`** — add a `String` branch using `UUID.fromString`.
3. **`Date` / `Date32` / `DateTime` / `DateTime64`** — add a `String` branch in the `writeDate` / `writeDate32` / `writeDateTime` / `writeDateTime64` helpers, which already dispatch on `LocalDate` / `ZonedDateTime` / `OffsetDateTime` / `Timestamp`. Fixing them there also covers their other callers.

### Backward compatibility

Items 2 and 3 are purely additive: those inputs throw today, so nothing that currently succeeds changes behaviour.

Item 1 has one deliberate behaviour change: `"-1"` into a `UInt64` column currently writes `18446744073709551615` and would now throw `NumberFormatException`. That replaces silent corruption with a loud error and aligns the String path with the existing `BigInteger` overload. Suggest keeping it as its own commit so it can be reviewed separately from the additive branches.

The `Long` / `Number` path stays permissive and passes raw bits through unchanged — callers legitimately supply the bit pattern for values above 2^63.

## Why it matters

Reported from the ClickHouse Flink connector. Its checkpoint state format serialises map keys as strings, so for a `Map(K, V)` column the key reaches `serializeMapData` (`:478`) → `serializePrimitiveData` as a `String`. The connector currently has to reject `Map(UInt64, …)`, `Map(UUID, …)`, `Map(Date, …)`, `Map(Date32, …)` and `Map(DateTime(64), …)` at planning time and tell users to change their table DDL, even though all of these are legal ClickHouse map key types.

More generally, any caller passing a `String` value for one of these types — nested or top-level — hits the same behaviour.

Start in client-v2/src/main/java/com/clickhouse/client/api/data_formats/internal/SerializerUtils.java at serializePrimitiveData and trace the UInt64, UUID, date, and date-time helper paths. Verify the existing conversion behavior and the related BinaryStreamUtils unsigned-long range check. Done means String values are handled consistently for these types, invalid UInt64 values fail instead of silently wrapping, and existing signed or numeric paths remain unchanged.

Written by the indexing model from the issue text.