Add SelectionList concept

[matmair]

This PR adds the concept of SelectionLists - a way to define reusable choices for parameters (optionally controllable by plugins).

This is helpful to load and sync a list of choices into multiple instances. The usage of SelectionLists could be extended in the future.

Screenshots

CUI

PUI

ToDo:

• PUI unit testing
• locking SelectionList
• list deactivation logic

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[codecov]

Codecov Report

Attention: Patch coverage is 89.32384% with 30 lines in your changes missing coverage. Please review.

Project coverage is 84.59%. Comparing base (20fb125) to head (58e321f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/frontend/src/forms/selectionListFields.tsx	19.04%	17 Missing ⚠️
...rontend/src/components/forms/fields/TableField.tsx	33.33%	6 Missing ⚠️
src/frontend/src/components/render/ModelType.tsx	0.00%	2 Missing ⚠️
src/frontend/src/forms/PartForms.tsx	60.00%	1 Missing and 1 partial ⚠️
...rc/frontend/src/tables/part/SelectionListTable.tsx	90.00%	2 Missing ⚠️
...end/src/pages/Index/Settings/AdminCenter/Index.tsx	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8054      +/-   ##
==========================================
+ Coverage   84.56%   84.59%   +0.03%     
==========================================
  Files        1178     1183       +5     
  Lines       53727    54000     +273     
  Branches     2027     2032       +5     
==========================================
+ Hits        45432    45682     +250     
- Misses       7789     7815      +26     
+ Partials      506      503       -3     

Flag	Coverage Δ
backend	86.02% <100.00%> (+0.08%)	⬆️
migrations	42.67% <42.38%> (-0.01%)	⬇️
pui	68.98% <57.74%> (-0.09%)	⬇️

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[SchrodingersGat]

@matmair this is looking pretty good in general. A few small notes below as I review:

Admin Center

I like the sub-table addition within the form:

Can we add a "number of items" column to the table? There is no way to see if a given selection list has any items until you click to edit it:

[matmair]

@SchrodingersGat I have addressed all open requests

[SchrodingersGat]

Can you please bump the API version? I will review again :)

[matmair]

@SchrodingersGat done

[SchrodingersGat]

@matmair this is all looking nice, thanks for the good work on this!