feat(Facebook Lead Ads Trigger Node): Add Facebook Lead Ads Trigger Node (#7113)

Github issue / Community forum post (link here to close automatically):
https://community.n8n.io/t/facebook-lead-ads-integration/4590/19

---------

Co-authored-by: Marcus <marcus@n8n.io>

packages/nodes-base/nodes/FacebookLeadAds/methods/index.ts

@@ -0,0 +1 @@
+export * as listSearch from './listSearch';

packages/nodes-base/nodes/FacebookLeadAds/methods/listSearch.ts

@@ -0,0 +1,42 @@
+import type { ILoadOptionsFunctions, INodeListSearchResult } from 'n8n-workflow';
+import { facebookFormList, facebookPageList } from '../GenericFunctions';
+
+const filterMatches = (name: string, filter?: string): boolean =>
+	!filter || name?.toLowerCase().includes(filter.toLowerCase());
+
+export async function pageList(
+	this: ILoadOptionsFunctions,
+	filter?: string,
+	paginationToken?: string,
+): Promise<INodeListSearchResult> {
+	const { data: pages, paging } = await facebookPageList.call(this, paginationToken);
+	return {
+		results: pages
+			.filter((page) => filterMatches(page.name, filter))
+			.map((page) => ({
+				name: page.name,
+				value: page.id,
+				url: `https://facebook.com/${page.id}`,
+			})),
+		paginationToken: paging?.cursors?.after,
+	};
+}
+
+export async function formList(
+	this: ILoadOptionsFunctions,
+	filter?: string,
+	paginationToken?: string,
+): Promise<INodeListSearchResult> {
+	const pageId = this.getNodeParameter('page', '', { extractValue: true }) as string;
+
+	const { data: forms, paging } = await facebookFormList.call(this, pageId, paginationToken);
+	return {
+		results: forms
+			.filter((form) => filterMatches(form.name, filter))
+			.map((form) => ({
+				name: form.name,
+				value: form.id,
+			})),
+		paginationToken: paging?.cursors?.after,
+	};
+}