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/generic.ts

@@ -0,0 +1,64 @@
+async function getAccessToken() {
+	return '';
+}
+
+export async function authenticatedFetch<T>(...args: Parameters<typeof fetch>): Promise<T> {
+	const accessToken = await getAccessToken();
+
+	const response = await fetch(args[0], {
+		...args[1],
+		mode: 'cors',
+		cache: 'no-cache',
+		headers: {
+			...(accessToken ? { authorization: `Bearer ${accessToken}` } : {}),
+			...args[1]?.headers,
+		},
+	});
+
+	return (await response.json()) as Promise<T>;
+}
+
+export async function get<T>(
+	url: string,
+	query: Record<string, string> = {},
+	options: RequestInit = {},
+) {
+	let resolvedUrl = url;
+	if (Object.keys(query).length > 0) {
+		resolvedUrl = `${resolvedUrl}?${new URLSearchParams(query).toString()}`;
+	}
+
+	return authenticatedFetch<T>(resolvedUrl, { ...options, method: 'GET' });
+}
+
+export async function post<T>(url: string, body: object = {}, options: RequestInit = {}) {
+	return authenticatedFetch<T>(url, {
+		...options,
+		method: 'POST',
+		body: JSON.stringify(body),
+	});
+}
+
+export async function put<T>(url: string, body: object = {}, options: RequestInit = {}) {
+	return authenticatedFetch<T>(url, {
+		...options,
+		method: 'PUT',
+		body: JSON.stringify(body),
+	});
+}
+
+export async function patch<T>(url: string, body: object = {}, options: RequestInit = {}) {
+	return authenticatedFetch<T>(url, {
+		...options,
+		method: 'PATCH',
+		body: JSON.stringify(body),
+	});
+}
+
+export async function del<T>(url: string, body: object = {}, options: RequestInit = {}) {
+	return authenticatedFetch<T>(url, {
+		...options,
+		method: 'DELETE',
+		body: JSON.stringify(body),
+	});
+}