Allow usage of readOnly and WriteOnly tags on $ref nodes

fix #34

Motivation and Context

See #34

Description

When setting node validations, the original fragment is also passed to the function to be able to parse readOnly and writeOnly tags. If no original fragment is provided, the function works as before, to not introduce breaking changes.

How Has This Been Tested?

Unit tests were added to assure correct validation.

Screenshot(s)/recordings(s)

See #34

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• This PR's code follows as closely as possible the coding style/guidelines of this project.
• I have added error reporting and followed the error reporting guidelines.
• I have added event tracking and followed the event tracking guidelines.
• I have updated any relevant documentation accordingly to reflect this PR's changes.
• I have added automated tests (unit/integration/e2e/other) to cover my changes.
• All new and existing tests pass locally (excluding flaky CI tests).