Make CrudMethodMetadataPostProcessor public and make factory  getTargetRepository() not final (so factory can be extended)


From #1873

For the custom repository - I don't know why the factory getTargetRepository() method is final. If it wasn't, you could just extend the existing couchbase factory. Similarily with the CrudMethodMetadataPostProcessor - if it was public, you could just use it instead of redefining it. Those two things can be changed to make your implementation a little easier.