Add poisedness check for sample quality

[segsell]

Add function to calculate the lambda poisedness of a sample.

[codecov[bot]]

Codecov Report

Merging #399 (4a52526) into main (608dc5c) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #399      +/-   ##
==========================================
+ Coverage   92.82%   92.86%   +0.04%     
==========================================
  Files         223      225       +2     
  Lines       17459    17589     +130     
==========================================
+ Hits        16206    16334     +128     
- Misses       1253     1255       +2     

Impacted Files	Coverage Δ
src/estimagic/optimization/tranquilo/geometry.py	96.87% <ø> (ø)
src/estimagic/optimization/tranquilo/poisedness.py	100.00% <100.00%> (ø)
tests/optimization/tranquilo/test_poisedness.py	100.00% <100.00%> (ø)
src/estimagic/optimization/subsolvers/_trsbox.py	84.95% <0.00%> (-0.82%)	:arrow_down:
src/estimagic/optimization/subsolvers/bntr.py	87.20% <0.00%> (ø)

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