[mlir][linalg][transform][python] Add type arg to MatchOp extension.

The extension class to MatchOp has a class method called match_op_names.
The previous version of that function did not allow to specify the
result type. This, however, may be useful/necessary if the op consuming
the resulting handle requires a particular type (such as the
bufferization.EmptyTensorToAllocTensorOp). This patch adds an overload
to match_op_names that allows to specify the result type.

Reviewed By: ftynse

Differential Revision: https://reviews.llvm.org/D155567