Add bounds to BHHH

[segsell]

Add bounds to BHHH algorithm.

To-Do:

• Implement box constraints
• Refactor
• Add more test cases

[codecov]

Codecov Report

Merging #376 (f1626cd) into main (79e8a0e) will increase coverage by 0.05%.
The diff coverage is 96.66%.

@@            Coverage Diff             @@
##             main     #376      +/-   ##
==========================================
+ Coverage   92.88%   92.93%   +0.05%     
==========================================
  Files         223      223              
  Lines       17396    17525     +129     
==========================================
+ Hits        16158    16287     +129     
  Misses       1238     1238              

Impacted Files	Coverage Δ
tests/optimization/test_pounders_integration.py	100.00% <ø> (+7.54%)	⬆️
src/estimagic/optimization/bhhh.py	91.34% <93.10%> (+8.01%)	⬆️
tests/optimization/test_bhhh.py	100.00% <100.00%> (ø)
...magic/optimization/subsolvers/_trsbox_quadratic.py	84.55% <0.00%> (-0.82%)	⬇️
src/estimagic/optimization/subsolvers/bntr.py	87.20% <0.00%> (ø)

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