Elevate CredentialManager to toplevel module

[mih]

datalad_next.utils.credman -> datalad_next.credman

Closes #228

This is the start of a more stringent and versatile implementation of the functionality exposed by CredentialManager

[codecov]

Codecov Report

Base: 89.51% // Head: 91.28% // Increases project coverage by +1.77% 🎉

Coverage data is based on head (46209ac) compared to base (bc979ab).
Patch coverage: 97.25% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
+ Coverage   89.51%   91.28%   +1.77%     
==========================================
  Files          72       74       +2     
  Lines        6839     6565     -274     
==========================================
- Hits         6122     5993     -129     
+ Misses        717      572     -145     

Impacted Files	Coverage Δ
datalad_next/utils/credman.py	0.00% <0.00%> (-98.24%)	⬇️
datalad_next/credman/manager.py	98.23% <98.23%> (ø)
datalad_next/commands/credentials.py	99.00% <100.00%> (ø)
datalad_next/credman/__init__.py	100.00% <100.00%> (ø)
datalad_next/credman/tests/test_credman.py	100.00% <100.00%> (ø)
datalad_next/utils/__init__.py	82.53% <100.00%> (ø)
datalad_next/annexremotes/uncurl.py	95.04% <0.00%> (-4.14%)	⬇️
datalad_next/gitremotes/datalad_annex.py	88.98% <0.00%> (-0.28%)	⬇️
datalad_next/_version.py	100.00% <0.00%> (+54.60%)	⬆️

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