feat: cached ebrains queries

[xgui3783]

fixes #212 #243

[codecov-commenter]

Codecov Report

Merging #254 (8707ec2) into refactor_v0.4 (7c5e05a) will increase coverage by 0.13%.
The diff coverage is 45.54%.

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@@                Coverage Diff                @@
##           refactor_v0.4     #254      +/-   ##
=================================================
+ Coverage          35.92%   36.06%   +0.13%     
=================================================
  Files                 59       59              
  Lines               4721     4814      +93     
=================================================
+ Hits                1696     1736      +40     
- Misses              3025     3078      +53     

Impacted Files	Coverage Δ
siibra/retrieval/repositories.py	30.72% <14.81%> (-1.40%)	⬇️
siibra/retrieval/datasets.py	48.43% <33.33%> (-0.77%)	⬇️
siibra/retrieval/requests.py	48.96% <56.06%> (+2.09%)	⬆️
siibra/livequeries/ebrains.py	26.02% <66.66%> (ø)
siibra/features/external/__init__.py	66.66% <100.00%> (ø)
siibra/features/external/ebrains.py	46.66% <100.00%> (ø)

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