Support custom user model

[matmair]

This PR refactors the usage of the build in User model to support custom auth models

• refactors all uses of User
• Add migrations/refactor migrations
• Docs
• [ ] unit tests to ensure custom user models work

[netlify]

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🔨 Latest commit	9546179
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[wolflu05]

Does this also break related model fields in plugins that use the auth.user model?

[matmair]

@wolflu05 yes, that is the main "breaking" thing

[matmair]

This is targeted for 0.16.0 now and will be revisited once 0.15.0 is out.

I think it is already advisable for plugin deps to either target Owners or the django.cong.settings auth model - a list of best practices is on my personal roadmap for 0.16.0

[codecov]

Codecov Report

Attention: Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.43%. Comparing base (bb93c91) to head (9546179).
Report is 296 commits behind head on master.

Files	Patch %	Lines
src/backend/InvenTree/InvenTree/serializers.py	66.66%	1 Missing ⚠️
src/backend/InvenTree/build/api.py	50.00%	1 Missing ⚠️
src/backend/InvenTree/users/api.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6418      +/-   ##
==========================================
- Coverage   83.96%   83.43%   -0.54%     
==========================================
  Files        1057     1046      -11     
  Lines       46498    45806     -692     
  Branches     1360     1192     -168     
==========================================
- Hits        39043    38217     -826     
- Misses       7102     7335     +233     
+ Partials      353      254      -99     

Flag	Coverage Δ
backend	85.42% <91.17%> (ø)

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[SchrodingersGat]

@matmair LGTM

• Any documentation needed around this?
• What happens to the migrations if a custom user model is actually used? Do we need to edit existing migrations?

[matmair]

Needs docs

• What happens to the migrations if a custom user model is actually used? Do we need to edit existing migrations?

I have tested that it works but I will try to add a CI test for that too

[SchrodingersGat]

@matmair do you want to target 0.16.x or bump to 0.17.x?

[matmair]

@SchrodingersGat let's move this, I am focusing on getting user custom states in for 0.16.x

[matmair]

Closing this in favour of an upcoming PR that adds a custom user model