extend pydantic model

[xgui3783]

add type field to connectivity response
add modality field to parcellation

[codecov-commenter]

Codecov Report

Merging #163 (cf49c3f) into main (2885fc1) will increase coverage by 0.98%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #163      +/-   ##
==========================================
+ Coverage   59.77%   60.75%   +0.98%     
==========================================
  Files          32       32              
  Lines        4348     4350       +2     
==========================================
+ Hits         2599     2643      +44     
+ Misses       1749     1707      -42     

Impacted Files	Coverage Δ
siibra/core/parcellation.py	76.85% <100.00%> (+0.10%)	⬆️
siibra/features/connectivity.py	92.09% <100.00%> (+19.19%)	⬆️
siibra/core/serializable_concept.py	94.28% <0.00%> (+2.85%)	⬆️

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