Protobuf codegen for Golang

[uatuko]

Protobuf generated code for Golang (for the public API), which is intended to be used for client implementations.

Unfortunately there's no option to just generate client only code for Go, so the server stubs are also there.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.50%. Comparing base (d00df95) to head (47f28fc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #119   +/-   ##
=======================================
  Coverage   95.50%   95.50%           
=======================================
  Files          19       19           
  Lines        1246     1246           
  Branches      141      141           
=======================================
  Hits         1190     1190           
  Misses         38       38           
  Partials       18       18           

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