Diversify Item type classes

[mih]

Originally introduced in
#361, but a need for this has also been expressed elsewhere, hence now a standalone changeset.

These types could also move into datalad_next.types...

[codecov]

Codecov Report

Patch coverage: 95.28% and project coverage change: +0.02 🎉

Comparison is base (db38176) 92.30% compared to head (ec7614a) 92.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #392      +/-   ##
==========================================
+ Coverage   92.30%   92.33%   +0.02%     
==========================================
  Files         109      109              
  Lines        8262     8280      +18     
==========================================
+ Hits         7626     7645      +19     
+ Misses        636      635       -1     

Impacted Files	Coverage Δ
datalad_next/datasets/__init__.py	93.33% <90.90%> (ø)
datalad_next/annexremotes/archivist.py	92.50% <92.50%> (+2.69%)	⬆️
datalad_next/annexremotes/tests/test_archivist.py	98.09% <98.09%> (+0.13%)	⬆️
datalad_next/__init__.py	100.00% <100.00%> (ø)
datalad_next/annexremotes/__init__.py	100.00% <100.00%> (ø)
datalad_next/annexremotes/uncurl.py	94.91% <100.00%> (ø)
datalad_next/iter_collections/utils.py	97.50% <100.00%> (+0.62%)	⬆️
datalad_next/runners/exceptions.py	100.00% <100.00%> (ø)
datalad_next/runners/tests/test_exceptions.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[christian-monch]

I like it, it makes sense to me (we already discussed the general idea here: #372 (comment)).

As with most categorization efforts, things might change slightly in the future, but I think this is a good trajectory.