feat: add OSMWayLoader

[Calychas]

Closes #78

[Calychas]

Still lacks tests. Will add them soon

[codecov]

Codecov Report

Merging #166 (a173f00) into main (78d0fbb) will increase coverage by 0.27%.
The diff coverage is 97.09%.

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
+ Coverage   93.82%   94.09%   +0.27%     
==========================================
  Files          41       44       +3     
  Lines        1117     1288     +171     
==========================================
+ Hits         1048     1212     +164     
- Misses         69       76       +7     

Flag	Coverage Δ
macos-latest-python3.10	?
ubuntu-latest-python3.10	94.02% <97.09%> (+0.28%)	⬆️
ubuntu-latest-python3.8	94.08% <97.04%> (+0.26%)	⬆️
ubuntu-latest-python3.9	94.00% <97.04%> (+0.27%)	⬆️

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

Impacted Files	Coverage Δ
srai/exceptions.py	90.00% <83.33%> (-10.00%)	⬇️
srai/loaders/osm_way_loader/osm_way_loader.py	97.31% <97.31%> (ø)
srai/loaders/__init__.py	100.00% <100.00%> (ø)
srai/loaders/osm_way_loader/__init__.py	100.00% <100.00%> (ø)
srai/loaders/osm_way_loader/constants.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[RaczeQ]

Keep OSM_TAGS definition in the same format as @simonusher provided in hex2vec implementation.

[piotrgramacki]

Nice work!

[simonusher]

I left you a couple of comments about some minor details to change, and a broken import in the example notebook