chore(core, structure): various minor improvements for testing, addon dataset and search params

[jordanl17]

Description

This is part of a few PRs from the COREL feature branch which can be merged to next standalone. This PR includes smaller and miscellaneous changes.

What to review

Broken down by commit:

1. Creating a single addon dataset provider
2. Additional context added to TestProvider for use when testing
3. Supporting stick search params in URLS
4. API to validate references in documents

Testing

Notes for release

N/A