Feature/password hashing

[johnabass]

This PR adds basic password hashing support. The password hashing is modular and extensible, and currently only bcrypt is supported because it's easy.

Included is also a command-line tool for generating hashes in the OpenSSL crypt format. We can use that command to nab the string that should be put into configuration files for servers that accept basic auth or other password-like secrets. The configuration files no longer need to be closed source or encrypted, as any secrets will be one-way hashed.

[codecov]

Codecov Report

Attention: Patch coverage is 96.07843% with 2 lines in your changes missing coverage. Please review.

Project coverage is 99.76%. Comparing base (af4b32b) to head (a94899c).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/hash/main.go	90.47%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #291      +/-   ##
===========================================
- Coverage   100.00%   99.76%   -0.24%     
===========================================
  Files           21       25       +4     
  Lines          789      840      +51     
===========================================
+ Hits           789      838      +49     
- Misses           0        2       +2     

Flag	Coverage Δ
unittests	99.76% <96.07%> (-0.24%)	⬇️

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