Add nil hash validation

[AnkushinDaniil]

Fix #2239
Continue #2290

Protocol Buffer Validation:

• p2p/spec/common.proto: Added import for buf/validate/validate.proto and added a required field validation to message Hash. [1] [2]
• p2p/sync/client.go: Integrated protovalidate for validating protocol buffer messages in the requestAndReceiveStream function. [1] [2] [3]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.53%. Comparing base (6bf445a) to head (da2677d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2296      +/-   ##
==========================================
- Coverage   74.54%   74.53%   -0.02%     
==========================================
  Files         111      111              
  Lines       12792    12792              
==========================================
- Hits         9536     9534       -2     
- Misses       2536     2538       +2     
  Partials      720      720              

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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.