feature/add-perplexity-node (#4376)

* added perplexity node

* last stable release

* Update ChatPerplexity.ts

* update

* Update ChatPerplexity.ts

* Update ChatPerplexity.ts

* pnpm lint fix

* feat: update @langchain/community from 0.3.24 to 0.3.29

---------

Co-authored-by: Marvin <marvin.chin@regentmarkets.com>

packages/components/nodes/chatmodels/ChatPerplexity/FlowiseChatPerplexity.ts

@@ -0,0 +1,32 @@
+import { ChatPerplexity as LangchainChatPerplexity, type PerplexityChatInput } from '@langchain/community/chat_models/perplexity'
+import { IMultiModalOption, IVisionChatModal } from '../../../src'
+
+// Extend the Langchain ChatPerplexity class to include Flowise-specific properties and methods
+export class ChatPerplexity extends LangchainChatPerplexity implements IVisionChatModal {
+    configuredModel: string
+    configuredMaxToken?: number
+    multiModalOption: IMultiModalOption
+    id: string
+
+    constructor(id: string, fields: PerplexityChatInput) {
+        super(fields)
+        this.id = id
+        this.configuredModel = fields?.model ?? '' // Use model from fields
+        this.configuredMaxToken = fields?.maxTokens
+    }
+
+    // Method to revert to the original model configuration
+    revertToOriginalModel(): void {
+        this.model = this.configuredModel
+        this.maxTokens = this.configuredMaxToken
+    }
+
+    // Method to set multimodal options
+    setMultiModalOption(multiModalOption: IMultiModalOption): void {
+        this.multiModalOption = multiModalOption
+    }
+
+    setVisionModel(): void {
+        // pass
+    }
+}