ArrowFlightJdbcArray.getArray(index, count) can read past the end of the array slice

`ArrowFlightJdbcArray.checkBoundaries` validates the caller-supplied index against `startOffset + valuesCount`:

```java
private void checkBoundaries(long index, int count) {
if (index < 0 || index + count > this.startOffset + this.valuesCount) {
throw new ArrayIndexOutOfBoundsException();
}
}
```

but `index` is relative to the start of the array; both call sites add `startOffset` to it only afterwards, e.g.

```java
checkBoundaries(index, count);
return getArrayNoBoundCheck(
this.dataVector, LargeMemoryUtil.checkedCastToInt(this.startOffset + index), count);
```

So the accepted range is too large by exactly `startOffset` elements, and `getArray(index, count)` / `getResultSet(index, count)` will read up to that far past the end of the row's slice.

`AbstractArrowFlightJdbcListVectorAccessor` builds these with the offsets of the list element being read, so any row of a list column that does not start at child offset 0 is affected. Reading within the element count the driver itself advertises then returns values belonging to other rows of the shared child vector, and past the child vector's `valueCount` it returns whatever is in allocated-but-unwritten memory.

Reproducer against an `IntVector` of 127 values, with an array covering elements 5..7:

```java
ArrowFlightJdbcArray array = new ArrowFlightJdbcArray(dataVector, 5, 3);
array.getArray(1, 3); // accepted; returns elements 6, 7, 8 — element 8 is outside the array
```

Every existing test constructs the array with `startOffset` 0, where the wrong bound happens to coincide with the correct one, which is why this is not currently caught.

从 ArrowFlightJdbcArray.checkBoundaries 开始，检查 getArray(index, count) 和 getResultSet(index, count) 两者的调用点。使用非零 startOffset 添加回归测试，例如使用提供的 IntVector slice，并运行现有的 ArrowFlightJdbcArray 测试；完成的标准是请求无法读取超出数组 slice 的范围。

由索引模型根据 Issue 内容生成。