Basic operator API

[poszu]

Closes #139

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (75f2917) 94.01% compared to head (49faffc) 94.04%.

Files	Patch %	Lines
service/src/service.rs	94.68%	5 Missing ⚠️
service/src/operator.rs	93.02%	3 Missing ⚠️
src/prove.rs	90.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   94.01%   94.04%   +0.02%     
==========================================
  Files          25       26       +1     
  Lines        3126     3239     +113     
==========================================
+ Hits         2939     3046     +107     
- Misses        187      193       +6     

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[pigmej]

@poszu we need to merge that for the upcoming 1:n post-service demos.