feat(Qdrant Vector Store Node): Qdrant vector store support (#8080)

## Summary
This PR intends to add [Qdrant](https://qdrant.tech/) as a supported
vectorstore node to load and retrieve documents from in a workflow.


## Review / Merge checklist
- [x] PR title and summary are descriptive. 
- [x] Node/credentials documentation to be updated in
https://github.com/n8n-io/n8n-docs/pull/1796.

---------

Co-authored-by: oleg <me@olegivaniv.com>
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/@n8n/nodes-langchain/nodes/vector_store/shared/descriptions.ts

@@ -45,3 +45,26 @@ export const supabaseTableNameRLC: INodeProperties = {
 		},
 	],
 };
+
+export const qdrantCollectionRLC: INodeProperties = {
+	displayName: 'Qdrant Collection',
+	name: 'qdrantCollection',
+	type: 'resourceLocator',
+	default: { mode: 'list', value: '' },
+	required: true,
+	modes: [
+		{
+			displayName: 'From List',
+			name: 'list',
+			type: 'list',
+			typeOptions: {
+				searchListMethod: 'qdrantCollectionsSearch',
+			},
+		},
+		{
+			displayName: 'ID',
+			name: 'id',
+			type: 'string',
+		},
+	],
+};

packages/@n8n/nodes-langchain/nodes/vector_store/shared/methods/listSearch.ts

@@ -1,5 +1,6 @@
 import { ApplicationError, type IDataObject, type ILoadOptionsFunctions } from 'n8n-workflow';
 import { Pinecone } from '@pinecone-database/pinecone';
+import { QdrantClient } from '@qdrant/js-client-rest';
 
 export async function pineconeIndexSearch(this: ILoadOptionsFunctions) {
 	const credentials = await this.getCredentials('pineconeApi');
@@ -49,3 +50,21 @@ export async function supabaseTableNameSearch(this: ILoadOptionsFunctions) {
 
 	return { results };
 }
+
+export async function qdrantCollectionsSearch(this: ILoadOptionsFunctions) {
+	const credentials = await this.getCredentials('qdrantApi');
+
+	const client = new QdrantClient({
+		url: credentials.qdrantUrl as string,
+		apiKey: credentials.apiKey as string,
+	});
+
+	const response = await client.getCollections();
+
+	const results = response.collections.map((collection) => ({
+		name: collection.name,
+		value: collection.name,
+	}));
+
+	return { results };
+}