editoast: add model update trait

[flomonster]

close #3603

[codecov]

Codecov Report

Merging #3631 (b4f88ee) into dev (2001e9c) will decrease coverage by 0.07%.
The diff coverage is 45.16%.

❗ Current head b4f88ee differs from pull request most recent head b2bf66d. Consider uploading reports for the commit b2bf66d to get more accurate results

@@             Coverage Diff              @@
##                dev    #3631      +/-   ##
============================================
- Coverage     68.25%   68.19%   -0.07%     
  Complexity     1917     1917              
============================================
  Files           421      421              
  Lines         21279    21285       +6     
  Branches       1555     1555              
============================================
- Hits          14525    14516       -9     
- Misses         6021     6036      +15     
  Partials        733      733              

Flag	Coverage Δ
editoast	74.62% <45.16%> (-0.40%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
editoast/src/models/mod.rs	25.00% <0.00%> (-8.34%)	⬇️
editoast/src/models/projects.rs	64.28% <0.00%> (-17.54%)	⬇️
editoast/src/models/study.rs	92.30% <ø> (+5.94%)	⬆️
editoast/src/views/study.rs	92.94% <100.00%> (-0.17%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[multun]

I don't see any way of restricting what fields can be updated: updating id, or other fks, might break the app
EDIT: my bad