Fix false positives in typing.Protocol

[pm3512]

Description

Adds the ast_scope package and uses scoping information to find functions in subclasses of typing.Protocol and mark them and their arguments as used.

Related Issue

Resolves #309

Checklist:

• I have updated the documentation in the README.md file or my changes don't require an update.
• I have added an entry in CHANGELOG.md.
• I have added or adapted tests to cover my changes.
• I have run tox -e fix-style to format my code and checked the result with tox -e style.

[codecov-commenter]

Codecov Report

Merging #313 (d6c182e) into main (e2e84d0) will increase coverage by 0.03%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #313      +/-   ##
==========================================
+ Coverage   98.94%   98.98%   +0.03%     
==========================================
  Files          21       21              
  Lines         665      690      +25     
==========================================
+ Hits          658      683      +25     
  Misses          7        7              

Impacted Files	Coverage Δ
vulture/core.py	98.63% <100.00%> (+0.10%)	⬆️

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[btschroer]

Nice 👍