Add validation steps to embedders

[simonusher]

closes #277

[codecov]

Codecov Report

Merging #332 (ed9790c) into main (6f86d36) will decrease coverage by 0.72%.
The diff coverage is 64.00%.

❗ Current head ed9790c differs from pull request most recent head 7e0cc63. Consider uploading reports for the commit 7e0cc63 to get more accurate results

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
- Coverage   91.71%   91.00%   -0.72%     
==========================================
  Files          60       60              
  Lines        2112     2145      +33     
==========================================
+ Hits         1937     1952      +15     
- Misses        175      193      +18     

Flag	Coverage Δ
macos-latest-python3.11	90.48% <64.00%> (-0.71%)	⬇️
ubuntu-latest-python3.10	89.79% <64.00%> (-0.70%)	⬇️
ubuntu-latest-python3.11	89.79% <64.00%> (-0.70%)	⬇️
ubuntu-latest-python3.8	89.77% <64.00%> (-0.70%)	⬇️
ubuntu-latest-python3.9	89.77% <64.00%> (-0.70%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
srai/embedders/gtfs2vec/model.py	80.55% <12.50%> (-19.45%)	⬇️
srai/embedders/highway2vec/model.py	97.05% <50.00%> (-2.95%)	⬇️
srai/embedders/hex2vec/embedder.py	72.91% <62.50%> (-1.81%)	⬇️
srai/embedders/highway2vec/embedder.py	66.66% <72.72%> (-2.00%)	⬇️
srai/embedders/gtfs2vec/embedder.py	78.99% <80.95%> (-1.75%)	⬇️

... and 1 file with indirect coverage changes

[piotrgramacki]

LGTM