make A[begin:stride:end] work

[bjarthur]

also mostly from claude

[mkitti]

Thr main deficit is that begin and end do not work for indexing, I believe.

[bjarthur]

they work for me with this PR. i'll add some tests.

julia> size(A)
(1000, 20000)

julia> A[1:3:10,1]
TensorStore(UInt32, rank=1, shape=(4,))

julia> A[1:3:10,1].read().result()
4-element PyArray{UInt32, 1}:
 0x00000000
 0x00000000
 0x00000000
 0x00000000

julia> A[begin:3:10,1].read().result()
4-element PyArray{UInt32, 1}:
 0x00000000
 0x00000000
 0x00000000
 0x00000000

julia> A[end-10:3:end,1].read().result()
4-element PyArray{UInt32, 1}:
 0x00000000
 0x00000000
 0x00000000
 0x00000000