Add `DirectiveSources` field to `ParseOptions`

[dengsh12]

Proposed changes

Add a DirectiveSources field in ParseOptions. This field aims for users to indicate the OSS/N+ version, and dynamic modules they want to include for validation. If it is provided, it will be the only source of directives included in validation, and ParseOptions.MatchFuncs will be ignored

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• [x] I have read the CONTRIBUTING document
• [x] If applicable, I have added tests that prove my fix is effective or that my feature works
• [x] If applicable, I have checked that any relevant tests pass after adding my changes
• [ ] I have updated any relevant documentation (README.md)