Event enum

[SchrodingersGat]

Enumerate available "events" as Enum values, rather than raw strings:

• Ensure that the values can be accurately registered
• Ability to introspect on available event names
• Automatically document available events
• Ensure plugins keep up to date with event names

TODO

• Update documentation
• Add unit testing (ensure correct events are triggered)
• Work with python 3.9

[netlify]

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Name	Link
🔨 Latest commit	dcc0e72
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[codecov]

Codecov Report

Attention: Patch coverage is 88.59060% with 17 lines in your changes missing coverage. Please review.

Project coverage is 84.55%. Comparing base (db128f9) to head (dcc0e72).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backend/InvenTree/order/models.py	60.00%	6 Missing ⚠️
src/backend/InvenTree/plugin/base/event/events.py	60.00%	4 Missing ⚠️
src/backend/InvenTree/InvenTree/unit_test.py	92.59%	2 Missing ⚠️
src/backend/InvenTree/part/events.py	0.00%	2 Missing ⚠️
src/backend/InvenTree/plugin/registry.py	50.00%	2 Missing ⚠️
src/backend/InvenTree/build/models.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8573      +/-   ##
==========================================
- Coverage   84.57%   84.55%   -0.02%     
==========================================
  Files        1183     1185       +2     
  Lines       54100    54183      +83     
  Branches     2044     2026      -18     
==========================================
+ Hits        45756    45816      +60     
- Misses       7835     7861      +26     
+ Partials      509      506       -3     

Flag	Coverage Δ
backend	86.06% <88.59%> (+0.04%)	⬆️

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