Diverse active learning

[MojiFarmanbar]

• Implementing diverse mini-batch active learning based on cardinal package.
• adjusting matching_base and deduplicator to accept the new method as an argument.
• updated test_active_learning to include the new class
• in order to test, you can run example_matcher notebook by adding a new argument in the Matcher object, active_learning_method = 'diverse_batch'.