feat(editor): add edgeless crud extension (#9335)

blocksuite/affine/block-surface/src/extensions/query.ts

@@ -0,0 +1,16 @@
+import type { NoteBlockModel } from '@blocksuite/affine-model';
+import type { BlockModel } from '@blocksuite/store';
+
+import type { Connectable } from '../managers/connector-manager';
+
+export function isConnectable(
+  element: BlockSuite.EdgelessModel | null
+): element is Connectable {
+  return !!element && element.connectable;
+}
+
+export function isNoteBlock(
+  element: BlockModel | BlockSuite.EdgelessModel | null
+): element is NoteBlockModel {
+  return !!element && 'flavour' in element && element.flavour === 'affine:note';
+}