Water bridge from iterable of mols

[cbouy]

Generalizes to any input (trajectory is already done, this introduces the missing support for Iterable[Molecule])

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 6 lines in your changes missing coverage. Please review.

Project coverage is 94.46%. Comparing base (711e037) to head (4a87e2e).

Files with missing lines	Patch %	Lines
prolif/interactions/water_bridge.py	81.25%	3 Missing ⚠️
prolif/typeshed.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           water_bridge     #237      +/-   ##
================================================
- Coverage         94.72%   94.46%   -0.26%     
================================================
  Files                22       23       +1     
  Lines              1650     1681      +31     
================================================
+ Hits               1563     1588      +25     
- Misses               87       93       +6     

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