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The initial bring-up of the Transform dialect relied on PDL to provide the default handle type (`!pdl.operation`) and the matching capability. Both are now provided natively by the Transform dialect removing the reason to have a hard dependency on the PDL dialect and its interpreter. Move PDL-related transform operations into a separate extension. This requires us to introduce a dialect state extension mechanism into the Transform dialect so it no longer needs to know about PDL constraint functions that may be injected by extensions similarly to operations and types. This mechanism will be reused to connect pattern application drivers and the Transform dialect. This completes the restructuring of the Transform dialect to remove overrilance on PDL. Note to downstreams: flow that are using `!pdl.operation` with Transform dialect operations will now require `transform::PDLExtension` to be applied to the transform dialect in order to provide the transform handle type interface for `!pdl.operation`. Reviewed By: springerm Differential Revision: https://reviews.llvm.org/D151104