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/constants/defaults.ts

@@ -0,0 +1,25 @@
+import type { ChatOptions } from '@/types';
+
+export const defaultOptions: ChatOptions = {
+	webhookUrl: 'http://localhost:5678',
+	webhookConfig: {
+		method: 'POST',
+		headers: {},
+	},
+	target: '#n8n-chat',
+	mode: 'window',
+	defaultLanguage: 'en',
+	initialMessages: ['Hi there! 👋', 'My name is Nathan. How can I assist you today?'],
+	i18n: {
+		en: {
+			title: 'Hi there! 👋',
+			subtitle: "Start a chat. We're here to help you 24/7.",
+			footer: '',
+			getStarted: 'New Conversation',
+			inputPlaceholder: 'Type your question..',
+		},
+	},
+	theme: {},
+};
+
+export const defaultMountingTarget = '#n8n-chat';

packages/@n8n/chat/src/constants/index.ts

@@ -0,0 +1,3 @@
+export * from './defaults';
+export * from './localStorage';
+export * from './symbols';

packages/@n8n/chat/src/constants/localStorage.ts

@@ -0,0 +1,2 @@
+export const localStorageNamespace = 'n8n-chat';
+export const localStorageSessionIdKey = `${localStorageNamespace}/sessionId`;

packages/@n8n/chat/src/constants/symbols.ts

@@ -0,0 +1,8 @@
+import type { InjectionKey } from 'vue';
+import type { Chat, ChatOptions } from '@/types';
+
+// eslint-disable-next-line @typescript-eslint/naming-convention
+export const ChatSymbol = 'Chat' as unknown as InjectionKey<Chat>;
+
+// eslint-disable-next-line @typescript-eslint/naming-convention
+export const ChatOptionsSymbol = 'ChatOptions' as unknown as InjectionKey<ChatOptions>;