Validate system constants - Closes #2889

[michielmulders]

What was the problem?

No validation present for system-wide constants when instantiating the app.

How did I fix it?

Add JSON Schema validation.

How to test it?

Run node index -n devnet or use any other network, inside of /src folder.

Review checklist

• The PR resolves Create controller/schemas/constants.js to validate system wide constants #2889
• All new code is covered with unit tests
• All new code was formatted with Prettier
• Linting passes
• Tests pass
• Commit messages follow the commit guidelines
• Documentation has been added/updated

[nazarhussain]

Please make above changes and just look into other places and where needed add proper ids to each schema.

[nazarhussain]

@michielmulders Please look into tests, seems they started failing now.

[shuse2]

we require a lot of specific format for validation.
Why don't we create validation folder (instead of putting in helper), and add custom format there to be used in the schema validation along with schema definition?
ie)

/controller
  /validation
    validator.js
    format.js
    schema_application.js (or schema/application.js)
    schema_config.js