Add init bindings to for params structs

[AntoinePrv]

Description

Type of Change

• Bugfix
• Feature / enhancement
• CI / Documentation
• Maintenance

Checklist

• My code follows the general style and conventions of the codebase, ensuring consistency
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run pre-commit run --all locally in the source folder and confirmed that there are no linter errors.
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 57 lines in your changes missing coverage. Please review.

Project coverage is 63.56%. Comparing base (0ad2c56) to head (3640830).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
libmambapy/src/libmambapy/bindings/legacy.cpp	0.00%	57 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3985      +/-   ##
==========================================
- Coverage   63.66%   63.56%   -0.10%     
==========================================
  Files         300      300              
  Lines       38344    38401      +57     
  Branches     2861     2861              
==========================================
- Hits        24412    24411       -1     
- Misses      13865    13923      +58     
  Partials       67       67              

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