feat(editor): replace spec provider with extension manager (#11861)

Closes: BS-3273

blocksuite/affine/all/package.json

@@ -208,7 +208,9 @@
     "./model": "./src/model/index.ts",
     "./sync": "./src/sync/index.ts",
     "./adapters": "./src/adapters/index.ts",
-    "./extensions": "./src/extensions/index.ts"
+    "./extensions": "./src/extensions/index.ts",
+    "./extensions/store": "./src/extensions/store.ts",
+    "./extensions/view": "./src/extensions/view.ts"
   },
   "files": [
     "src",