Update constraint interface

[timmens]

Update constraints interface according to EEP-02 (changes described here)

• Also adds some tests for pytree handling in derivatives

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Codecov Report

Attention: Patch coverage is 88.94472% with 22 lines in your changes missing coverage. Please review.

Project coverage is 90.73%. Comparing base (19029f5) to head (b0c0a62).

Files	Patch %	Lines
src/optimagic/constraints.py	85.31%	21 Missing ⚠️
...imagic/optimization/create_optimization_problem.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            0.5.0     #522      +/-   ##
==========================================
+ Coverage   90.67%   90.73%   +0.05%     
==========================================
  Files         105      106       +1     
  Lines       10182    10364     +182     
==========================================
+ Hits         9233     9404     +171     
- Misses        949      960      +11     

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[janosg]

Thanks!