Shared-memory-dict

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- Fix incorrect initialization through hook

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- Initialize memory with empty dict avoiding logs
- Call serialization with buffer instead of memoryview
- Treat null bytes on JSON loads

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- Run CI on different python versions
- Add support for python 3.10
- Improve README with more examples and calls to close and unlink
- Expose shared memory as readonly attribute as ShareableList
- Modify SharedMemoryDict to use serializers
- Create serializers for json and pickle

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- Replace SENTINEL with NOT_GIVEN
- Update project dependencies
- Add a better message on the storage issue

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- Configure black as formatter
- Implement Mapping interface (all methods)
- Deprecate `move_to_end and` method and `last` parameter on `popitem`

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- Remove method `validate_key` from Django adapter (this is a method to deal with memcached key name issues)
- Decrease shared-memory and pickle calls on Django Adapter
- Raise `TypeError` on `incr` method of Django Adapter for non int values
- Remover `cull` mechanism from django adapter