feat(Notion Node): Fetch child blocks recursively (#7304)

Github issue / Community forum post (link here to close automatically):

packages/nodes-base/nodes/Notion/GenericFunctions.ts

@@ -81,7 +81,6 @@ export async function notionApiRequestAllItems(
 	propertyName: string,
 	method: string,
 	endpoint: string,
-
 	body: any = {},
 	query: IDataObject = {},
 ): Promise<any> {
@@ -109,6 +108,48 @@ export async function notionApiRequestAllItems(
 	return returnData;
 }
 
+export async function notionApiRequestGetBlockChildrens(
+	this: IExecuteFunctions | ILoadOptionsFunctions | IPollFunctions,
+	blocks: IDataObject[],
+	responseData: IDataObject[] = [],
+	limit?: number,
+) {
+	if (blocks.length === 0) return responseData;
+
+	for (const block of blocks) {
+		responseData.push(block);
+
+		if (block.type === 'child_page') continue;
+
+		if (block.has_children) {
+			let childrens = await notionApiRequestAllItems.call(
+				this,
+				'results',
+				'GET',
+				`/blocks/${block.id}/children`,
+			);
+
+			childrens = (childrens || []).map((entry: IDataObject) => ({
+				object: entry.object,
+				parent_id: block.id,
+				...entry,
+			}));
+
+			await notionApiRequestGetBlockChildrens.call(this, childrens, responseData);
+		}
+
+		if (limit && responseData.length === limit) {
+			return responseData;
+		}
+
+		if (limit && responseData.length > limit) {
+			return responseData.slice(0, limit);
+		}
+	}
+
+	return responseData;
+}
+
 export function getBlockTypes() {
 	return [
 		{