[mlir][bufferization][NFC] Introduce BufferDeallocationOpInterface

This new interface allows operations to implement custom handling of ownership
values and insertion of dealloc operations which is useful when an op cannot
implement the interfaces supported by default by the buffer deallocation pass
(e.g., because they are not exactly compatible or because there are some
additional semantics to it that would render the default implementations in
buffer deallocation invalid, or because no interfaces exist for this kind of
behavior and it's not worth introducing one plus a default implementation in
buffer deallocation). Additionally, it can also be used to provide more
efficient handling for a specific op than the interface based default
implementations can.

Reviewed By: springerm

Differential Revision: https://reviews.llvm.org/D158756