feat: extend ieeg models to be in_roi, if provided

[xgui3783]

No description provided.

[codecov-commenter]

Codecov Report

Merging #178 (6cde7d1) into main (f75d7b9) will increase coverage by 1.07%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   61.45%   62.53%   +1.07%     
==========================================
  Files          32       32              
  Lines        4426     4441      +15     
==========================================
+ Hits         2720     2777      +57     
+ Misses       1706     1664      -42     

Impacted Files	Coverage Δ
siibra/features/ieeg.py	85.00% <95.65%> (+0.75%)	⬆️
siibra/core/space.py	50.11% <100.00%> (+4.67%)	⬆️
siibra/features/feature.py	64.82% <0.00%> (+8.69%)	⬆️

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