Implement SSIDDI

[YuWVandy]

Closes #11

Summary

• [1] Add the SSIDDI model and all its components to ssiddi.py

[codecov-commenter]

Codecov Report

Merging #77 (9460fd6) into main (424b440) will increase coverage by 0.70%. The diff coverage is 98.83%.

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   94.41%   95.12%   +0.70%     
==========================================
  Files          29       30       +1     
  Lines         985     1189     +204     
==========================================
+ Hits          930     1131     +201     
- Misses         55       58       +3     

Impacted Files	Coverage Δ
chemicalx/models/ssiddi.py	98.75% <98.73%> (-1.25%)	:arrow_down:
tests/unit/test_models.py	100.00% <100.00%> (ø)
chemicalx/models/deepdds.py	97.43% <0.00%> (-2.57%)	:arrow_down:
chemicalx/pipeline.py	87.67% <0.00%> (-0.91%)	:arrow_down:
chemicalx/models/caster.py	100.00% <0.00%> (ø)
chemicalx/loss.py	100.00% <0.00%> (ø)

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[benedekrozemberczki]

@cthoyt and @YuWVandy Refactored this one, added tests, documentation etc.