Maint: ebrains datasets, private some properties and methods

[AhmetNSimsek]

This was a result of a conversation with @dickscheid on 29.08.2023. detail property and parse_person() should be private as the users have no direct use for it.

@xgui3783, would you mind writing a doc string for _parse_person?

[codecov-commenter]

Codecov Report

Merging #444 (6bdca8e) into main (5a0e6b3) will increase coverage by 0.70%.
Report is 92 commits behind head on main.
The diff coverage is 27.46%.

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@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
+ Coverage   36.81%   37.52%   +0.70%     
==========================================
  Files          61       61              
  Lines        5421     5538     +117     
==========================================
+ Hits         1996     2078      +82     
- Misses       3425     3460      +35     

Files Changed	Coverage Δ
siibra/configuration/configuration.py	42.35% <ø> (ø)
siibra/configuration/factory.py	22.22% <0.00%> (+0.24%)	⬆️
siibra/core/atlas.py	85.71% <ø> (+1.23%)	⬆️
...a/features/connectivity/functional_connectivity.py	55.55% <0.00%> (ø)
siibra/livequeries/ebrains.py	25.35% <0.00%> (+0.35%)	⬆️
siibra/locations/boundingbox.py	19.88% <ø> (ø)
siibra/volumes/neuroglancer.py	21.42% <0.00%> (ø)
siibra/volumes/volume.py	50.29% <0.00%> (ø)
siibra/features/tabular/cortical_profile.py	26.43% <3.70%> (-4.23%)	⬇️
siibra/features/tabular/tabular.py	23.68% <3.70%> (-6.32%)	⬇️
... and 23 more

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[xgui3783]

IMO, this would be a breaking change, since we turn public attr to private attr

Why turn them private anyway?

[AhmetNSimsek]

I would normally agree but, in this case, we could not think of a reason for them to be exposed to the user. That is, it is not the same as hiding Feature.anchor which is frequently used. Does this impact siibra-api?