[mlir][vector] Add a new TD Op for patterns leveraging ShapeCastOp (#110525) Adds a new Transform Dialect Op that collects patters for dropping unit dims from various Ops: * `transform.apply_patterns.vector.drop_unit_dims_with_shape_cast`. It excludes patterns for vector.transfer Ops - these are collected under: * `apply_patterns.vector.rank_reducing_subview_patterns`, and use ShapeCastOp _and_ SubviewOp to reduce the rank (and to eliminate unit dims). This new TD Ops allows us to test the "ShapeCast folder" pattern in isolation. I've extracted the only test that I could find for that folder from "vector-transforms.mlir" and moved it to a dedicated file: "shape-cast-folder.mlir". I also added a test case with scalable vectors. Changes in VectorTransforms.cpp are not needed (added a comment with a TODO + ordered the patterns alphabetically). I am Including them here to avoid a separate PR.
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