[ui] AttributeEditor: Feature/attribute navigation buttons

[nicolas-lambert-tc]

Description

Add navigation buttons around attributes label in the AttributeEditor

If an attribute have linked attributes:

• a button appear on the left of the label, for input attributes
• a button appear on the right of the label, for output attributes

Features list

• Add navigation buttons on linked attributes, in the AttributeEditor
• On clicked, the linked attributes nodes are selected in the GraphEditor
• MiddleClick select the linked nodes and fit the view (not by default, because it can break current user workflow)
• When many attributes are connected, a context menu present the list of attributes to let the user choose the connection he wants to go through.
  

[codecov]

Codecov Report

Attention: Patch coverage is 79.59184% with 10 lines in your changes missing coverage. Please review.

Project coverage is 76.84%. Comparing base (006288a) to head (7881fa1).
Report is 42 commits behind head on develop.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/attribute.py	66.66%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2716      +/-   ##
===========================================
+ Coverage    76.75%   76.84%   +0.09%     
===========================================
  Files           40       41       +1     
  Lines         6082     6132      +50     
===========================================
+ Hits          4668     4712      +44     
- Misses        1414     1420       +6     

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