Typing stubs

[SpangleLabs]

This should close #151, type stubs for all the methods and classes in imagehash.py

[coveralls]

Coverage increased (+0.04%) to 89.535% when pulling 493bc2d on SpangleLabs:typing-stubs into 0abd487 on JohannesBuchner:master.

[Avasam]

• Callable should come from collections.abc
• In type stubs (and Python 3.10+), | is preferable over Union and Optional (ie: int | None)
• built-in generics (list, dict, tuple, set) is preferable over importing them from typing (except in type aliases, in base classes, and for arbitrary length tuples (Tuple[int, ...]))
• I think np.bool_ should be np.int32
• npt.NDArray is missing a type argument, which results in a partially Unknown type
  
  

But, given the above comments from @JohannesBuchner , I get the feeling you may have to use comment annotations for this to be accepted. See https://mypy.readthedocs.io/en/stable/python2.html

#151 (comment)

imagehash is trying to support python2

#151 (comment)

I am wondering how to do this with the least amount of future maintenance effort. I am worried that the stub file may become outdated if not care is taken.

[SpangleLabs]

Thank you @Avasam !