[mlir][vector] Add fold pattern to constant-fold InsertStridedSliceOp

Fold InsertStridedOp(ConstantOp into ConstantOp) -> ConstantOp.

This pattern comes with vector size threshold to make sure we do not
introduce too many large constants.

This help clean up code created by the Wide Integer Emulation pass.

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D138739