fix: Various JSON schema REST API export fix and enhancements

[fgschwan]

The aim for this PR is to change JSON schema generation to be able to generate examples by JSON schema using https://json-schema-faker.js.org/ . These examples should be

1. valid according to JSON schema validation (https://www.jsonschemavalidator.net/ , https://json-schema-validator.herokuapp.com/)
2. don't cause internal errors when yaml REST validation is used on them (that means that proto parsing and other internal processing should went ok and only KVScheduler.Validate can create validation errors)
3. more accurate/beautiful (proto model annotation for IP addresses converted to JSON schema for better json schema validation and valid ip address example value generation)

There are some code dependencies to not yet merged PR #1787 , therefore this PR is based on the commits of that PR. That means that commits of both PRs are visible here.(rebased)