feat(core): add copilot tags and collections graphql apis (#11076)

Close [BS-2834](https://linear.app/affine-design/issue/BS-2834).

### What Changed?
- Add `addContextCategoryMutation` and `removeContextCategoryMutation` graphql apis.
- Provide tag and collection apis for front-end components.

packages/common/graphql/src/schema.ts

@@ -2593,22 +2593,26 @@ export type ListContextObjectQuery = {
         }>;
         tags: Array<{
           __typename?: 'CopilotContextCategory';
+          type: ContextCategories;
           id: string;
           createdAt: number;
           docs: Array<{
             __typename?: 'CopilotDocType';
             id: string;
             status: ContextEmbedStatus | null;
+            createdAt: number;
           }>;
         }>;
         collections: Array<{
           __typename?: 'CopilotContextCategory';
+          type: ContextCategories;
           id: string;
           createdAt: number;
           docs: Array<{
             __typename?: 'CopilotDocType';
             id: string;
             status: ContextEmbedStatus | null;
+            createdAt: number;
           }>;
         }>;
       }>;