Add typing to aiida/common/{utils,extendeddicts}.py

[danielhollas]

This completes the typing of the aiida.common module.

The types in extendeddicts.py is kind of shoddy, and some function signatures are not typed since all the classes there are super-generic so they would all be mostly Any anyway. But I think it is still better than nothing and it is better than ignoring this file entirely.

Depends on #6704

[codecov]

Codecov Report

Attention: Patch coverage is 84.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 78.00%. Comparing base (199a027) to head (55d03cd).

Files with missing lines	Patch %	Lines
src/aiida/common/utils.py	89.66%	3 Missing ⚠️
src/aiida/orm/computers.py	50.00%	3 Missing ⚠️
src/aiida/orm/comments.py	33.34%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6706      +/-   ##
==========================================
+ Coverage   77.99%   78.00%   +0.01%     
==========================================
  Files         563      563              
  Lines       41762    41765       +3     
==========================================
+ Hits        32570    32573       +3     
  Misses       9192     9192              

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