Gromacs engine quality of life improvements

[hejung]

• expose mdrun_time_conversion_factor
• improved consistency checks for mdp options when performing energy minimization

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 6 lines in your changes missing coverage. Please review.

Project coverage is 65.00%. Comparing base (c9ede9e) to head (1b2f146).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/asyncmd/gromacs/mdengine.py	68.42%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   57.79%   65.00%   +7.21%     
==========================================
  Files          18       18              
  Lines        2362     2366       +4     
  Branches      324      325       +1     
==========================================
+ Hits         1365     1538     +173     
+ Misses        922      723     -199     
- Partials       75      105      +30     

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