Schemas for the unstable module, and tests for schemas

[einarmo]

Also aligns us a bit more with the python utils, and fixes a few issues.

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.81%. Comparing base (db85f0e) to head (81a68c0).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...xtractorUtils/Unstable/DestinationUtilsUnstable.cs	33.33%	2 Missing ⚠️
...xtractorUtils/Unstable/Configuration/Connection.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #645      +/-   ##
==========================================
+ Coverage   77.76%   77.81%   +0.05%     
==========================================
  Files         136      136              
  Lines       13223    13223              
  Branches     1991     1991              
==========================================
+ Hits        10283    10290       +7     
+ Misses       2106     2095      -11     
- Partials      834      838       +4     

Files with missing lines	Coverage Δ
...xtractorUtils/Unstable/Configuration/Connection.cs	62.96% <50.00%> (ø)
...xtractorUtils/Unstable/DestinationUtilsUnstable.cs	69.56% <33.33%> (ø)

... and 4 files with indirect coverage changes

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