[mlir][arith] Add narrowing patterns to commute more vector ops
This commutes the extension (`arith.extsi`, `arith.extui`) over the following vector ops: `vector.broadcast`, `vector.shape_cast`, `vector.transpose`, `vector.flat_transpose`. I focused on these as I saw them getting created by vector unroll patterns. Maybe except `vector.flat_transpose`. Reviewed By: antiagainst Differential Revision: https://reviews.llvm.org/D149534
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