Emoji

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* `typing-extensions` requires at least version `4.7.0` 297

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* Move type annotations inline
* Use `functools.lru_cache` for looking up emoji by name with `get_emoji_by_name()`
* Move internal functions `get_emoji_unicode_dict()`, `get_aliases_unicode_dict()`, `_EMOJI_UNICODE` and `_ALIASES_UNICODE` to `testutils`
* Add type hints to tests
* Remove obsolete dev dependency `coveralls`

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* Add missing stubs for purely_emoji

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* Update to Unicode v15.1

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* Fix slow import when debugging in Python 3.12 280

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* Added Arabic and Turkish translations