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/nodes-langchain/credentials/OllamaApi.credentials.ts

@@ -0,0 +1,34 @@
+import type { ICredentialTestRequest, ICredentialType, INodeProperties } from 'n8n-workflow';
+
+export class OllamaApi implements ICredentialType {
+	name = 'ollamaApi';
+
+	displayName = 'Ollama';
+
+	documentationUrl = 'ollama';
+
+	properties: INodeProperties[] = [
+		{
+			displayName: 'Base URL',
+			name: 'baseUrl',
+			required: true,
+			type: 'string',
+			default: 'http://localhost:11434',
+		},
+	];
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: '={{ $credentials.baseUrl }}',
+			url: '/api/generate',
+			method: 'POST',
+			headers: {
+				'anthropic-version': '2023-06-01',
+			},
+			body: {
+				model: 'llama2',
+				prompt: 'Hello',
+			},
+		},
+	};
+}