Implement DeepSynergy and EPGCN-DS models

[benedekrozemberczki]

Summary

• Adds a basic example and updates the docstrings for DeepSynergy.

• Adds EPGCNDS, tests, and examples.

• [X] Code passes all tests

• [X] Unit tests provided for these changes

• [X] Documentation and docstrings added for these changes

Changes

• Examples folder with DeepSynergy and EPGCN-DS (only uses sum-based operator for now).
• New docstrings in the documentation.

[codecov-commenter]

Codecov Report

Merging #27 (4a1d701) into main (c6e2f04) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   99.81%   99.82%           
=======================================
  Files          29       29           
  Lines         549      578   +29     
=======================================
+ Hits          548      577   +29     
  Misses          1        1           

Impacted Files	Coverage Δ
chemicalx/models/deepsynergy.py	100.00% <ø> (ø)
chemicalx/models/epgcnds.py	100.00% <100.00%> (ø)
tests/unit/test_models.py	100.00% <100.00%> (ø)

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