create two methods to reference in the action manager existing toolba…

[seb5g]

…rs and menus

[codecov]

Codecov Report

❌ Patch coverage is 22.22222% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.25%. Comparing base (f6b67fb) to head (1095e0b).
⚠️ Report is 8 commits behind head on 5.0.x_dev.

Files with missing lines	Patch %	Lines
src/pymodaq_gui/managers/action_manager.py	25.00%	6 Missing ⚠️
src/pymodaq_gui/utils/custom_app.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           5.0.x_dev     #129      +/-   ##
=============================================
- Coverage      64.30%   64.25%   -0.05%     
=============================================
  Files             73       73              
  Lines           9185     9194       +9     
=============================================
+ Hits            5906     5908       +2     
- Misses          3279     3286       +7     

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