LudovicRousseau / pyscard / 11323269743 / 16

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Test and improve the synchronization code

Added
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* Add tests to bring `Synchronization.py` to 100% coverage
* Add type annotations to the synchronization primitives
* Add `typing_extensions` as a Python 3.9 requirement;
  this is needed to annotate that the `synchronized()` decorator
  takes a function with a certain set of parameter and return types
  and returns a function with the same parameter and return types

Changed
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* Make the synchronized function's `self` parameter explicit;
  this allows the `self` parameter to be type-annotated
  so the dependency on the `self.mutex` attribute is explicit
* Use the `self.mutex` lock as a context manager
* Support keyword arguments to synchronized functions

Fixed
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* Wrap synchronized functions correctly;
  previous behavior was to lose the function name and docstring

Removed
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* Remove `print()` lines that are commented out
* Remove a `bytes` instance check; method names can only be strings

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