editoast_derive: add Search derive macro

[leovalais]

Part of #4580

Replaces the search.yml by derive annotations in order to declare which objects can be searched using utoipa annotations (that will come later).

[codecov]

Codecov Report

Merging #4590 (75a97f8) into dev (6d3fb02) will increase coverage by 0.14%.
Report is 1 commits behind head on dev.
The diff coverage is 0.00%.

❗ Current head 75a97f8 differs from pull request most recent head c5d9b0a. Consider uploading reports for the commit c5d9b0a to get more accurate results

@@             Coverage Diff              @@
##                dev    #4590      +/-   ##
============================================
+ Coverage     19.88%   20.03%   +0.14%     
  Complexity     2238     2238              
============================================
  Files           878      874       -4     
  Lines         90132    89318     -814     
  Branches       2299     2298       -1     
============================================
- Hits          17926    17895      -31     
+ Misses        70926    70144     -782     
+ Partials       1280     1279       -1     

Flag	Coverage Δ
editoast	64.75% <0.00%> (+0.05%)	⬆️

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

Files Changed	Coverage Δ
editoast/src/main.rs	34.14% <ø> (ø)
editoast/src/views/search/mod.rs	2.56% <0.00%> (+0.06%)	⬆️

... and 55 files with indirect coverage changes

[flomonster]

Fancy!
LGTM.