[mlir][xegpu] Add support for `vector.extract_strided_slice` XeGPU SIMT distribution with partial offsets. (#171512)
`vector.extract_strided_slice` can have two forms when specifying
offsets.
Case 1:
```
%1 = vector.extract_strided_slice %0 { offsets = [8, 0], sizes = [8, 16], strides = [1, 1]}
: vector<24x16xf32> to vector<8x16xf32>
```
Case 2:
```
%1 = vector.extract_strided_slice %0 { offsets = [8], sizes = [8], strides = [1]}
: vector<24x16xf32> to vector<8x16xf32>
```
These two ops means the same thing, but case 2 is syntactic sugar to
avoid specifying offsets for fully extracted dims. Currently case 2
fails in XeGPU SIMT distribution. This PR fixes this issue.
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