feat: Add AI tool building capabilities (#7336)

Github issue / Community forum post (link here to close automatically):
https://community.n8n.io/t/langchain-memory-chat/23733

---------

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Val <68596159+valya@users.noreply.github.com>
Co-authored-by: Alex Grozav <alex@grozav.com>
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
Co-authored-by: Deborah <deborah@starfallprojects.co.uk>
Co-authored-by: Jesper Bylund <mail@jesperbylund.com>
Co-authored-by: Jon <jonathan.bennetts@gmail.com>
Co-authored-by: Michael Kret <88898367+michael-radency@users.noreply.github.com>
Co-authored-by: Giulio Andreini <andreini@netseven.it>
Co-authored-by: Mason Geloso <Mason.geloso@gmail.com>
Co-authored-by: Mason Geloso <hone@Masons-Mac-mini.local>
Co-authored-by: Mutasem Aldmour <mutasem@n8n.io>

packages/@n8n/chat/src/api/message.ts

@@ -0,0 +1,31 @@
+import { get, post } from '@/api/generic';
+import type { ChatOptions, LoadPreviousSessionResponse, SendMessageResponse } from '@/types';
+
+export async function loadPreviousSession(sessionId: string, options: ChatOptions) {
+	const method = options.webhookConfig?.method === 'POST' ? post : get;
+	return method<LoadPreviousSessionResponse>(
+		`${options.webhookUrl}`,
+		{
+			action: 'loadPreviousSession',
+			sessionId,
+		},
+		{
+			headers: options.webhookConfig?.headers,
+		},
+	);
+}
+
+export async function sendMessage(message: string, sessionId: string, options: ChatOptions) {
+	const method = options.webhookConfig?.method === 'POST' ? post : get;
+	return method<SendMessageResponse>(
+		`${options.webhookUrl}`,
+		{
+			action: 'sendMessage',
+			sessionId,
+			message,
+		},
+		{
+			headers: options.webhookConfig?.headers,
+		},
+	);
+}