ADD: SearchAlgo Optuna w own search space

[adamovanja]

this PR:

• adds optuna as search algorithm with own conditional search space [1]
• adjusts launching script on slurm with one node and multiple nodes
• improves readme documentation

[1]: difference to closed PR #26 is that here Optuna contains own search space. PR #26 contains search space that could be used with many other search algorithms in ray tune.

[codecov]

Codecov Report

Attention: Patch coverage is 83.51648% with 15 lines in your changes missing coverage. Please review.

Project coverage is 49.24%. Comparing base (7c6061e) to head (509fc1a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
q2_ritme/tune_models.py	0.00%	11 Missing ⚠️
q2_ritme/model_space/static_searchspace.py	93.93%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   48.39%   49.24%   +0.85%     
==========================================
  Files          17       17              
  Lines        1029     1062      +33     
  Branches      156      160       +4     
==========================================
+ Hits          498      523      +25     
- Misses        520      527       +7     
- Partials       11       12       +1     

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