Add nil hash validation

[AnkushinDaniil]

Fix #2239
Continue #2290

This pull request introduces protobuf hash validation

This PR can be simplified with #2342

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.44%. Comparing base (5107487) to head (fac578b).
Report is 37 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2296      +/-   ##
==========================================
+ Coverage   75.42%   75.44%   +0.01%     
==========================================
  Files         107      107              
  Lines       11406    11406              
==========================================
+ Hits         8603     8605       +2     
+ Misses       2150     2149       -1     
+ Partials      653      652       -1     

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[pnowosie]

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[rodrigo-pino]

What does using buf in this PR is improving over not using buf?

Would adding buf means an extra dependency to compile Juno successfully or just for development? Should the use of buf be documented somewhere as dependency?

Some questions, trying to understand the code base

[AnkushinDaniil]

What does using buf in this PR is improving over not using buf?

Because we need to import "buf/validate/validate.proto";, which is external proto. protoc requires all proto files to be in the project.

Would adding buf means an extra dependency to compile Juno successfully or just for development? Should the use of buf be documented somewhere as dependency?

This is for development only. buf and protoc are tools that allow you to generate go files from proto files. The main difference is that buf generates remotely and has a more convenient configuration.