maint: region.supported_spaces and region.mapped_in_space()

[AhmetNSimsek]

fixes #239

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 45.44%. Comparing base (715eecc) to head (8e3952e).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
siibra/core/region.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #635      +/-   ##
==========================================
- Coverage   45.44%   45.44%   -0.01%     
==========================================
  Files          75       75              
  Lines        7198     7196       -2     
==========================================
- Hits         3271     3270       -1     
+ Misses       3927     3926       -1     

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