[FR] Add option for plugins to add header actions

[matmair]

Fixes #8593 Follow up to #9283

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[codecov[bot]]

Codecov Report

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

Project coverage is 86.56%. Comparing base (4d029b0) to head (dda2321). Report is 1 commits behind head on master.

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

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9570      +/-   ##
==========================================
- Coverage   86.56%   86.56%   -0.01%     
==========================================
  Files        1243     1243              
  Lines       54683    54692       +9     
  Branches     2230     2229       -1     
==========================================
+ Hits        47337    47344       +7     
- Misses       6780     6782       +2     
  Partials      566      566              

Flag	Coverage Δ
backend	88.51% <60.00%> (-0.01%)	:arrow_down:

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[SchrodingersGat]

Would you be happy to bump this to 1.1.0?

[matmair]

I have a huge backlog from being away, so sure if 1.0 is imminent