Supports type parameters and type aliases (pep 695)

[tristanlatr]

It looks like this:

TODO:

• Support type aliases in class body, it's only supported at the module level currently
• Do not show the declaration of type variables as links

[tristanlatr]

@iyakushev, are you still interested into working on this ? Thanks

[codecov]

Codecov Report

❌ Patch coverage is 96.47059% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.29%. Comparing base (a12ed4b) to head (c516b4d).

Files with missing lines	Patch %	Lines
pydoctor/model.py	93.87%	3 Missing ⚠️
pydoctor/templatewriter/pages/attributechild.py	82.35%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #772      +/-   ##
==========================================
+ Coverage   93.25%   93.29%   +0.03%     
==========================================
  Files          48       48              
  Lines        8884     9002     +118     
  Branches     1631     1645      +14     
==========================================
+ Hits         8285     8398     +113     
- Misses        339      344       +5     
  Partials      260      260              

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[github-actions]

According to pydoctor_primer, this change doesn't affect pydoctor warnings on a corpus of open source code. ✅