[MLIR][PDL] Add support for representing and lowering negated constraints

This commit enables modelling negation of native constraints.

This is accomplished through an attribute `isNegated` on the operations `pdl.apply_native_constraint` and `pdl_interp.apply_constraint` and according adjustments to the conversion in the ConvertPDLToPDLInterpPass.

Reviewed By: Mogball

Differential Revision: https://reviews.llvm.org/D153871