Add schemas when registering / updating nexus resources

[AurelienJaquier]

• add 'analysis suitable' notation
• refactor adding images to resources
• new function to update an EModel resource with images
• update an emodel with images after plotting in luigi pipeline when access point is nexus
• update emodel after validation instead of deprecating it and re-registering it (it was messing with emodel ids)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 22.89157% with 64 lines in your changes missing coverage. Please review.

Project coverage is 52.50%. Comparing base (8d5b0ab) to head (9d17a3f).
Report is 82 commits behind head on main.

Files with missing lines	Patch %	Lines
bluepyemodel/access_point/nexus.py	6.66%	42 Missing ⚠️
bluepyemodel/access_point/forge_access_point.py	6.25%	15 Missing ⚠️
bluepyemodel/tasks/emodel_creation/optimisation.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
- Coverage   60.07%   52.50%   -7.58%     
==========================================
  Files         109      124      +15     
  Lines        7838    10416    +2578     
==========================================
+ Hits         4709     5469     +760     
- Misses       3129     4947    +1818     

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[ilkilic]

Looks good! Thank you