[mlir][vector] Add deinterleave operation to vector dialect (#92409)

The deinterleave operation constructs two vectors from a single input
vector. The first result vector contains the elements from even indexes
of the input, and the second contains elements from odd indexes. This is
the inverse of a `vector.interleave` operation.

Each output's trailing dimension is half of the size of the input
vector's trailing dimension. This operation requires the input vector
to have a rank > 0 and an even number of elements in its trailing
dimension.

The operation supports scalable vectors.

Example:
```mlir
%0, %1 = vector.deinterleave %a
           : vector<8xi8> -> vector<4xi8>
%2, %3 = vector.deinterleave %b
           : vector<2x8xi8> -> vector<2x4xi8>
%4, %5 = vector.deinterleave %c
           : vector<2x8x4xi8> -> vector<2x8x2xi8>
%6, %7 = vector.deinterleave %d
           : vector<[8]xf32> -> vector<[4]xf32>
%8, %9 = vector.deinterleave %e
           : vector<2x[6]xf64> -> vector<2x[3]xf64>
%10, %11 = vector.deinterleave %f
           : vector<2x4x[6]xf64> -> vector<2x4x[3]xf64>
```