[mlir][linalg] Allow outer dims perm and untiled dims in pack/unpack generalization

Extends the pack/unpack generalization patterns to work for any packing
op with only full tiles. This produces a combination of rank-reduced
insert/extract slice ops paired with a transpose on the reduced shape,
similar to what the pattern currently produces for fully tiled
pack/unpacks. Note that only the outer dims are rank-reduced in this
pattern, leaving the shape of the inner tile intact.

Differential Revision: https://reviews.llvm.org/D147555