Expose geometry objects as the BoreschRestraintGeometry objects

[IAlibay]

Fixes #1577

I did the same in the ABFE Protocol since giving back the raw dictionary isn't very useful to a power user.
No news item required, this is non-released behaviour.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.40%. Comparing base (a2f08ac) to head (681673f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1578      +/-   ##
==========================================
- Coverage   95.44%   93.40%   -2.04%     
==========================================
  Files         174      174              
  Lines       14537    14545       +8     
==========================================
- Hits        13875    13586     -289     
- Misses        662      959     +297     

Flag	Coverage Δ
fast-tests	93.40% <100.00%> (?)
slow-tests	?

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[github-actions]

No API break detected ✅

[hannahbaumann]

Thanks @IAlibay , lgtm!