Implement `PageModel` class

[benwerner01]

🌟 What is the purpose of this PR?

This PR introduces the PageModel class, and basic ordered link functionality temporarily implemented in the LinkModel class.

🔗 Related links

• Asana task (internal)

🔍 What does this change?

• adds the page-related workspace types:
  • archived, summary, title, index property types
  • Page entity type
  • contain link type
• adds the text-related workspace types:
  • tokens property type
  • Text entity type
• adds the required LinkModel methods for creating/updating/removing ordered links (to allow for ordered blocks in pages)
• adds the PageModel class

📜 Does this require a change to the docs?

No.

⚠️ Known issues

• tests are not passing when run using single command (asana task)

🐾 Next steps

🛡 What tests cover this?

• link.model.test.ts has been updated to test ordered link functionality
• page.model.test.ts has been added to test page-related functionality

❓ How to test this?

Check the backend integration tests in CI, or run the backend integration tests locally.

📹 Demo

[lgtm-com[bot]]

This pull request introduces 1 alert when merging c75624bff80623507f2e64e66d4c18f2ce89fc16 into d9d542a3534c6f9f198625080625db45491ef909 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class