SlurmProcess: Add possibility to pass arbitrary options to sbatch via sbatch_options

[hejung]

So far this only adds the option to pass sbatch options to the SlurmProcess.

To be useful one still needs to make use of the new sbatch_options argument to the SlurmProcess in:

• SlurmGmxEngine
• SlurmTrajectoryFunction
• not sure if I forgot anything? :)

[codecov]

Codecov Report

Attention: Patch coverage is 47.50000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 57.06%. Comparing base (fd81a88) to head (badef1d).

Files with missing lines	Patch %	Lines
src/asyncmd/slurm.py	47.50%	18 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
- Coverage   57.24%   57.06%   -0.19%     
==========================================
  Files          18       18              
  Lines        2318     2357      +39     
  Branches      317      324       +7     
==========================================
+ Hits         1327     1345      +18     
- Misses        914      932      +18     
- Partials       77       80       +3     

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