Polish tranquilo interface

[mpetrosian]

• add docstring to main tranquilo function.
• make some hard-coded values arguments of the main tranquilo function

[codecov]

Codecov Report

Merging #390 (e64a92c) into main (e4c7c93) will decrease coverage by 0.01%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##             main     #390      +/-   ##
==========================================
- Coverage   92.61%   92.60%   -0.02%     
==========================================
  Files         207      207              
  Lines       16097    16100       +3     
==========================================
  Hits        14909    14909              
- Misses       1188     1191       +3     

Impacted Files	Coverage Δ
src/estimagic/optimization/pounders.py	93.98% <ø> (ø)
src/estimagic/optimization/tranquilo/fit_models.py	78.28% <80.00%> (+0.28%)	⬆️
src/estimagic/optimization/tranquilo/tranquilo.py	91.85% <100.00%> (+0.06%)	⬆️
...magic/optimization/subsolvers/_trsbox_quadratic.py	84.89% <0.00%> (-0.82%)	⬇️
...ptimization/subsolvers/bounded_newton_quadratic.py	85.96% <0.00%> (-0.44%)	⬇️

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[janosg]

Thanks!