refactor(editor): rename block-std to std (#11250)

Closes: BS-2946

blocksuite/framework/std/src/extension/flavour.ts

@@ -0,0 +1,26 @@
+import type { ExtensionType } from '@blocksuite/store';
+
+import { BlockFlavourIdentifier } from '../identifier.js';
+
+/**
+ * Create a flavour extension.
+ *
+ * @param flavour
+ * The flavour of the block that the extension is for.
+ *
+ * @example
+ * ```ts
+ * import { FlavourExtension } from '@blocksuite/std';
+ *
+ * const MyFlavourExtension = FlavourExtension('my-flavour');
+ * ```
+ */
+export function FlavourExtension(flavour: string): ExtensionType {
+  return {
+    setup: di => {
+      di.addImpl(BlockFlavourIdentifier(flavour), () => ({
+        flavour,
+      }));
+    },
+  };
+}