feat(server): comment model (#12760)

close CLOUD-226

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced support for comments and replies within workspaces and
documents, enabling users to create, update, delete, and resolve
comments, as well as manage threaded replies.
- **Bug Fixes**
- Added user-friendly error messages and handling for situations where
comments or replies are not found.
- **Tests**
- Added comprehensive tests to ensure correct behavior of comment and
reply operations.
- **Localization**
  - Added English translations for new comment and reply error messages.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->














#### PR Dependency Tree


* **PR #12760** 👈
  * **PR #12909**
    * **PR #12911**
      * **PR #12761**
        * **PR #12924**
          * **PR #12925**

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

packages/backend/server/src/schema.gql

@@ -539,6 +539,7 @@ enum ErrorNames {
   CAN_NOT_BATCH_GRANT_DOC_OWNER_PERMISSIONS
   CAN_NOT_REVOKE_YOURSELF
   CAPTCHA_VERIFICATION_FAILED
+  COMMENT_NOT_FOUND
   COPILOT_ACTION_TAKEN
   COPILOT_CONTEXT_FILE_NOT_SUPPORTED
   COPILOT_DOCS_NOT_FOUND
@@ -628,6 +629,7 @@ enum ErrorNames {
   OWNER_CAN_NOT_LEAVE_WORKSPACE
   PASSWORD_REQUIRED
   QUERY_TOO_LONG
+  REPLY_NOT_FOUND
   RUNTIME_CONFIG_NOT_FOUND
   SAME_EMAIL_PROVIDED
   SAME_SUBSCRIPTION_RECURRING