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/editor-ui/src/__tests__/defaults.ts

@@ -5,8 +5,9 @@ import {
 	MANUAL_TRIGGER_NODE_TYPE,
 } from '@/constants';
 import nodeTypesJson from '../../../nodes-base/dist/types/nodes.json';
+import aiNodeTypesJson from '../../../@n8n/nodes-langchain/dist/types/nodes.json';
 
-const allNodeTypes = [...nodeTypesJson];
+const allNodeTypes = [...nodeTypesJson, ...aiNodeTypesJson];
 
 function findNodeWithName(name: string): INodeTypeDescription {
 	return allNodeTypes.find((node) => node.name === name) as INodeTypeDescription;