ADD: classification NN and CORN NN options

[adamovanja]

this PR adds:

• Neural Network trained for classification but evaluated with RMSE [1]
• Neural Network with ordinal regression as implemented in CORN - also evaluated with RMSE [1]
• increases simulated data sample size

[1] reason: (to remain consistent with regression models)

[codecov]

Codecov Report

Attention: Patch coverage is 31.25000% with 55 lines in your changes are missing coverage. Please review.

Project coverage is 58.30%. Comparing base (d7a3858) to head (786b052).

Files	Patch %	Lines
q2_ritme/model_space/_static_trainables.py	25.49%	36 Missing and 2 partials ⚠️
q2_ritme/evaluate_models.py	0.00%	13 Missing ⚠️
q2_ritme/simulate_data.py	33.33%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
- Coverage   60.94%   58.30%   -2.65%     
==========================================
  Files          17       17              
  Lines         845      897      +52     
  Branches       67       84      +17     
==========================================
+ Hits          515      523       +8     
- Misses        329      369      +40     
- Partials        1        5       +4     

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