dev(hansbug): add constraint access

[HansBug]

Description

Related Issue

TODO

Check List

• merge the latest version source branch/repo, and resolve all the conflicts
• pass style check
• pass all the tests

[codecov]

Codecov Report

Merging #73 (0586b85) into main (d1902a5) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   99.00%   99.01%   +0.01%     
==========================================
  Files          36       36              
  Lines        2505     2537      +32     
==========================================
+ Hits         2480     2512      +32     
  Misses         25       25              

Flag	Coverage Δ
unittests	99.01% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
treevalue/tree/tree/constraint.pyx	97.91% <100.00%> (+0.22%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.