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.

tools/cli/package.json

@@ -6,7 +6,7 @@
     "@affine/env": "workspace:*",
     "@affine/templates": "workspace:*",
     "@aws-sdk/client-s3": "^3.620.0",
-    "@blocksuite/affine": "0.17.18",
+    "@blocksuite/affine": "0.17.19",
     "@clack/core": "^0.3.4",
     "@clack/prompts": "^0.7.0",
     "@magic-works/i18n-codegen": "^0.6.0",