Minimal changes to get desired tracklet id functionality

[cmalinmayor]

Potential, less drastic alternative to #213

Includes changing the default arg in tracks, and a larger change to the segmentation export where we don't allow passing in any feature key anymore - just specify if you want the segmentation relabeled by lienage id or track id or not.

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.38%. Comparing base (d4a4596) to head (a2d269b).

Files with missing lines	Patch %	Lines
...rc/funtracks/import_export/_export_segmentation.py	93.33%	1 Missing ⚠️
src/funtracks/import_export/_validation.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #226      +/-   ##
==========================================
+ Coverage   93.29%   93.38%   +0.08%     
==========================================
  Files          59       59              
  Lines        3222     3233      +11     
==========================================
+ Hits         3006     3019      +13     
+ Misses        216      214       -2     

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[TeunHuijben]

@cmalinmayor, thanks! I changed some docstrings in my last commit:

Question:

• does this replace rename track_id to tracklet_id for consistency #213?

Comments:

• import csv (src/funtracks/import_export/csv/_import.py#L154-L161): track_id not recorded in geff metadata when a older csv is loaded with track_id instead of tracklet_id
• Do we accept that when loading an older geff that has "track_id", that we ignore that entry, and recompute the new "tracklet_id"? I think we should; we will otherwise forever have to deal with backward compatibility and detect both names. Just to flag this.
• create_empty_graphview_graph still has a special case for track_id, keep this, or rename to tracklet_id?