fix: protocol version is validated only for buffers

[shumkov]

Issue being fixed or feature implemented

In the current implementation, the protocol version is validated only during the Buffer decode process. When Buffer is decoded to raw object, outdated checks from JSON schema are applied.

What was done?

• Remove JSON Schema validation rules for protocol version
• Move protocol version validation from the decodeProtocolEntity function to basic validation functions

How Has This Been Tested?

With tests

Breaking Changes

Already described in #217

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[jawid-h]

Looks good