refactor: move chat block to affine (#8368)

[BS-898](https://linear.app/affine-design/issue/BS-898/move-ai-chat-block-to-affine)

Should be merged after https://github.com/toeverything/blocksuite/pull/8420 merged and bumped.

packages/frontend/component/package.json

@@ -60,7 +60,7 @@
     "zod": "^3.22.4"
   },
   "devDependencies": {
-    "@blocksuite/affine": "0.17.18",
+    "@blocksuite/affine": "0.17.19",
     "@blocksuite/icons": "2.1.68",
     "@chromatic-com/storybook": "^2.0.0",
     "@storybook/addon-essentials": "^8.2.9",