✨ Add unknown_label and use dict for output in Collection.mapped

[Koncopd]

Subj. Also allows to select label keys for encoding.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6b6b941) 92.55% compared to head (5153717) 92.56%.
Report is 22 commits behind head on main.

Files	Patch %	Lines
lamindb/dev/_mapped_collection.py	96.96%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1443   +/-   ##
=======================================
  Coverage   92.55%   92.56%           
=======================================
  Files          44       44           
  Lines        4395     4439   +44     
=======================================
+ Hits         4068     4109   +41     
- Misses        327      330    +3     

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[github-actions]

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[jkobject]

I would rename "get_label_weights" to "get_label_freqs" or something. Because the weight one would want might often not be "1/count" this seems too much for most applications..

[Koncopd]

#1460

[Koncopd]

But i think calling this frequencies is more misleading.