fix: use common interface in joiners and loaders

[piotrgramacki]

Closes #230

[codecov]

Codecov Report

Merging #235 (2a44b61) into main (fa5c79a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #235   +/-   ##
=======================================
  Coverage   97.78%   97.79%           
=======================================
  Files          52       52           
  Lines        1491     1495    +4     
=======================================
+ Hits         1458     1462    +4     
  Misses         33       33           

Flag	Coverage Δ
macos-latest-python3.10	?
ubuntu-latest-python3.10	97.79% <100.00%> (+0.07%)	⬆️
ubuntu-latest-python3.8	97.71% <100.00%> (+<0.01%)	⬆️
ubuntu-latest-python3.9	97.71% <100.00%> (-0.07%)	⬇️

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Impacted Files	Coverage Δ
srai/joiners/_base.py	100.00% <ø> (ø)
srai/joiners/intersection_joiner.py	100.00% <100.00%> (ø)
srai/loaders/_base.py	100.00% <100.00%> (ø)
srai/loaders/geoparquet_loader.py	100.00% <100.00%> (ø)
srai/loaders/gtfs_loader.py	100.00% <100.00%> (ø)
srai/loaders/osm_loaders/_base.py	97.77% <100.00%> (+0.05%)	⬆️
srai/loaders/osm_loaders/osm_online_loader.py	100.00% <100.00%> (ø)
srai/loaders/osm_loaders/osm_pbf_loader.py	92.50% <100.00%> (ø)
srai/loaders/osm_way_loader/osm_way_loader.py	98.12% <100.00%> (+0.01%)	⬆️

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