feat: add forEach command

packages/core/src/commands/forEach.ts

@@ -0,0 +1,24 @@
+import { Command, RawCommands } from '../types'
+
+declare module '@tiptap/core' {
+  interface Commands<ReturnType> {
+    forEach: {
+      /**
+       * Loop through an array of items.
+       */
+      forEach: <T>(
+        items: T[],
+        fn: (
+          item: T,
+          props: Parameters<Command>[0] & {
+            index: number,
+          },
+        ) => boolean,
+      ) => ReturnType,
+    }
+  }
+}
+
+export const forEach: RawCommands['forEach'] = (items, fn) => props => {
+  return items.every((item, index) => fn(item, { ...props, index }))
+}