[FR] Add option for plugins to add header actions

[matmair]

Fixes #8593
Follow up to #9283

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[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 86.33%. Comparing base (adb2ba3) to head (d55e7fd).

Files with missing lines	Patch %	Lines
src/backend/InvenTree/plugin/base/ui/tests.py	50.00%	3 Missing ⚠️
...lugin/samples/integration/user_interface_sample.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9570      +/-   ##
==========================================
- Coverage   86.35%   86.33%   -0.03%     
==========================================
  Files        1229     1229              
  Lines       53963    53972       +9     
  Branches     2260     2259       -1     
==========================================
- Hits        46602    46596       -6     
- Misses       6789     6804      +15     
  Partials      572      572              

Flag	Coverage Δ
backend	88.28% <60.00%> (-0.04%)	⬇️

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