Implement Index for LogicalArray e.g. UuidArray

[johanpel]

No description provided.

[mbrobbel]

We can just forward to the inner, however, to make this ergonomic we need a wrapping type for the returned Index::Item<'a> to make it usable as a T. I think for T: Copy this is trivial, but requires the concept of ReferenceType<'a> for ArrayType impls to support T: !Copy types.

impl<
        T: LogicalArrayType<T>,
        const NULLABLE: bool,
        Buffer: BufferType,
        OffsetItem: OffsetElement,
        UnionLayout: UnionType,
    > Index for LogicalArray<T, NULLABLE, Buffer, OffsetItem, UnionLayout>
where
    Option<T>: ArrayType<T>,
    <T as LogicalArrayType<T>>::ArrayType: Nullability<NULLABLE>,
    <<T as LogicalArrayType<T>>::ArrayType as Nullability<NULLABLE>>::Item:
        ArrayType<<T as LogicalArrayType<T>>::ArrayType>,
    <<<T as LogicalArrayType<T>>::ArrayType as Nullability<NULLABLE>>::Item as ArrayType<
        <T as LogicalArrayType<T>>::ArrayType,
    >>::Array<Buffer, OffsetItem, UnionLayout>: Index,
{
    type Item<'a> = <<<<T as LogicalArrayType<T>>::ArrayType as Nullability<NULLABLE>>::Item as ArrayType<
        <T as LogicalArrayType<T>>::ArrayType,
    >>::Array<Buffer, OffsetItem, UnionLayout> as Index>::Item<'a>
    where
        Self: 'a;

    unsafe fn index_unchecked(&self, index: usize) -> Self::Item<'_> {
        self.0.index_unchecked(index)
    }
}