[ui/core] GroupAttributes connection

[nicolas-lambert-tc]

Description

This PR add the possibility to connect GroupAttribute based on this PR (From @cbentejac)

It adds:

• Connection on Group

• GroupAttributes can be folded even if connected
  

GroupAttribute connection link the subAttributes:

Features list

• Allow GroupAttribute connection
• Connecting a GroupAttribute connect automatically all subAttributes
• Disconnecting a subAttribute automatically disconnect the parnt GroupAttribute
• Connection is handled in ui.graph, so undo are correctly handled
• Add a function to check the attributes compatibility

Implementation remarks

[codecov]

Codecov Report

Attention: Patch coverage is 90.71038% with 17 lines in your changes missing coverage. Please review.

Project coverage is 79.27%. Comparing base (7c66c56) to head (8d316bf).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/attribute.py	82.75%	15 Missing ⚠️
meshroom/core/exception.py	75.00%	1 Missing ⚠️
meshroom/core/graph.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##           dev/connectGroupAttrs    #2754      +/-   ##
=========================================================
+ Coverage                  78.94%   79.27%   +0.33%     
=========================================================
  Files                         50       53       +3     
  Lines                       6662     6829     +167     
=========================================================
+ Hits                        5259     5414     +155     
- Misses                      1403     1415      +12     

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