Add configurable license and available_licenses info fields

[ml-evs]

Closes #1254. Duplicate of #1423 which has to be remerged due to a failed release.

To-do:

• Add to models
• Add to OpenAPI
• Add to config and server response
• Testing
• Documentation

[codecov]

Codecov Report

Attention: Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.54%. Comparing base (9fb6d3d) to head (07b9d81).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
optimade/server/config.py	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2224      +/-   ##
==========================================
- Coverage   90.54%   90.54%   -0.01%     
==========================================
  Files          75       75              
  Lines        4865     4885      +20     
==========================================
+ Hits         4405     4423      +18     
- Misses        460      462       +2     

Flag	Coverage Δ
project	90.54% <91.30%> (-0.01%)	⬇️
validator	90.54% <91.30%> (-0.01%)	⬇️

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