Define public API of datalad_next.types

[mih]

See #613

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (bc530e3) 92.99% compared to head (f3534b5) 20.33%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
datalad_next/types/__init__.py	0.00%	3 Missing ⚠️
datalad_next/annexremotes/archivist.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #617       +/-   ##
===========================================
- Coverage   92.99%   20.33%   -72.66%     
===========================================
  Files         160      161        +1     
  Lines       11866    11476      -390     
  Branches     1794     1345      -449     
===========================================
- Hits        11035     2334     -8701     
- Misses        643     9081     +8438     
+ Partials      188       61      -127     

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