feat: domain controller for apache .htdigest files

[leo9800]

wsgidav/dc/htdigest_dc.py: implement HtdigestDomainController class
sample_wsgidav: config entries for HtdigestDomainController

closes #349

[codecov]

Codecov Report

❌ Patch coverage is 0% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.66%. Comparing base (983f886) to head (5f2be22).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
wsgidav/dc/htdigest_dc.py	0.00%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #356      +/-   ##
==========================================
- Coverage   43.90%   43.66%   -0.24%     
==========================================
  Files          30       31       +1     
  Lines        4940     4967      +27     
==========================================
  Hits         2169     2169              
- Misses       2771     2798      +27     

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[leo9800]

cheers, and sorry for did something sloppy not adding changelog XD

[mar10]

No worries and thanks for your contributions