apply visibility to QAction when adding widgets

[seb5g]

once a widget is added in a toolbar, the visibility should be applied to the underlying action. This PR allows this with the action_manager

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.63%. Comparing base (5a19319) to head (6fc6838).
⚠️ Report is 2 commits behind head on 5.0.x_dev.

Files with missing lines	Patch %	Lines
src/pymodaq_gui/managers/action_manager.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           5.0.x_dev     #108      +/-   ##
=============================================
- Coverage      63.64%   63.63%   -0.02%     
=============================================
  Files             74       74              
  Lines           9067     9070       +3     
=============================================
+ Hits            5771     5772       +1     
- Misses          3296     3298       +2     

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