feat(editor): comment extension (#12948)

#### PR Dependency Tree


* **PR #12948** 👈
  * **PR #12980**

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

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

## Summary by CodeRabbit

* **New Features**
* Introduced inline comment functionality, allowing users to add,
resolve, and highlight comments directly within text.
  * Added a new toolbar action for inserting comments when supported.
* Inline comments are visually highlighted and can be interacted with in
the editor.

* **Enhancements**
  * Integrated a feature flag to enable or disable the comment feature.
* Improved inline manager rendering to support wrapper specs for
advanced formatting.

* **Developer Tools**
* Added mock comment provider for testing and development environments.

* **Chores**
* Updated dependencies and project references to support the new inline
comment module.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/modules/feature-flag/constant.ts

@@ -264,6 +264,13 @@ export const AFFINE_FLAGS = {
     configurable: isCanaryBuild,
     defaultState: false,
   },
+  enable_comment: {
+    category: 'affine',
+    displayName: 'Enable Comment',
+    description: 'Enable comment',
+    configurable: isCanaryBuild,
+    defaultState: true,
+  },
 } satisfies { [key in string]: FlagInfo };
 
 // oxlint-disable-next-line no-redeclare