credentials: cache interactive credentials in memory

[pmrowla]

Fixes #221

[codecov-commenter]

Codecov Report

Patch coverage: 32.11% and project coverage change: -2.01 ⚠️

Comparison is base (4605cd3) 81.61% compared to head (6025f04) 79.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
- Coverage   81.61%   79.60%   -2.01%     
==========================================
  Files          26       26              
  Lines        3677     3776      +99     
  Branches      646      663      +17     
==========================================
+ Hits         3001     3006       +5     
- Misses        573      675     +102     
+ Partials      103       95       -8     

Impacted Files	Coverage Δ
src/scmrepo/git/__init__.py	84.78% <ø> (+0.49%)	⬆️
src/scmrepo/git/backend/dulwich/client.py	41.37% <28.57%> (-26.81%)	⬇️
src/scmrepo/git/credentials.py	26.12% <31.03%> (-11.88%)	⬇️
src/scmrepo/git/backend/dulwich/asyncssh_vendor.py	74.60% <33.33%> (-5.58%)	⬇️
src/scmrepo/git/backend/pygit2/callbacks.py	50.00% <42.85%> (-3.34%)	⬇️

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