Feature/Add Neo4j GraphRag support (#3686)

* added: Neo4j database connectivity, Neo4j credentials, supports the usage of the GraphCypherQaChain node and modifies the FewShotPromptTemplate node to handle variables from the prefix field.

* Merge branch 'main' of github.com:FlowiseAI/Flowise into feature/graphragsupport

* revert pnpm-lock.yaml

* add: neo4j package

* Refactor GraphCypherQAChain: Update version to 1.0, remove memory input, and enhance prompt handling

- Changed version from 2.0 to 1.0.
- Removed the 'Memory' input parameter from the GraphCypherQAChain.
- Made 'cypherPrompt' optional and improved error handling for prompt validation.
- Updated the 'init' and 'run' methods to streamline input processing and response handling.
- Enhanced streaming response logic based on the 'returnDirect' flag.

* Refactor GraphCypherQAChain: Simplify imports and update init method signature

- Consolidated import statements for better readability.
- Removed the 'input' and 'options' parameters from the 'init' method, streamlining its signature to only accept 'nodeData'.

* add output, format final response, fix optional inputs

---------

Co-authored-by: Henry <hzj94@hotmail.com>

packages/components/credentials/Neo4jApi.credential.ts

@@ -0,0 +1,39 @@
+import { INodeParams, INodeCredential } from '../src/Interface'
+
+class Neo4jApi implements INodeCredential {
+    label: string
+    name: string
+    version: number
+    description: string
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'Neo4j API'
+        this.name = 'neo4jApi'
+        this.version = 1.0
+        this.description =
+            'Refer to <a target="_blank" href="https://neo4j.com/docs/operations-manual/current/authentication-authorization/">official guide</a> on Neo4j authentication'
+        this.inputs = [
+            {
+                label: 'Neo4j URL',
+                name: 'url',
+                type: 'string',
+                description: 'Your Neo4j instance URL (e.g., neo4j://localhost:7687)'
+            },
+            {
+                label: 'Username',
+                name: 'username',
+                type: 'string',
+                description: 'Neo4j database username'
+            },
+            {
+                label: 'Password',
+                name: 'password',
+                type: 'password',
+                description: 'Neo4j database password'
+            }
+        ]
+    }
+}
+
+module.exports = { credClass: Neo4jApi }