Make mypy happy (explicit reexport)

[a1d4r]

What is the current behavior?

Mypy in strict mode is not happy about the library:

error: Module "decimify" does not explicitly export attribute "decimify"  [attr-defined]
    from decimify import decimify

The error is caused by rule --no-implicit-reexport. There are two ways how to fix it: either define __all__ in __init__.py or use import aliases so that other modules can import it. In this PR I added an alias for an import in __init__.py.

What is the new behavior?

• Added an import alias
• Ignored ruff rule PLC0414 (see: useless-import-alias (PLC0414) rule contradicts PEP484 astral-sh/ruff#6294)
• Ignored .idea folder for contributors using Pycharm (such as me)

Does this introduce a breaking change?

• Yes
• No

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (72265e4) to head (9f09cf0).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #154   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           55        55           
=========================================
  Hits            55        55           

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