Added NeMo Guardrails Chat component (#3331)

* added: nemoguardrails chat component

* fix: removed options argument from init

fix: generation text has been updated with content string

* fix: lint error fixed

* fix: error when get content

* fix: lint errors

* updated: added handleLLMNewToken for ChatNemoGuardrails

---------

Co-authored-by: patrick <patrick.alves@br.experian.com>

packages/components/nodes/chatmodels/ChatNemoGuardrails/NemoClient.ts

@@ -0,0 +1,70 @@
+import { AIMessage, BaseMessage, HumanMessage, SystemMessage } from '@langchain/core/messages'
+
+export interface Config {
+    baseUrl: string
+    configurationId: string
+}
+
+export class ClientConfig implements Config {
+    baseUrl: string
+    configurationId: string
+
+    constructor(baseUrl: string, configurationId: string) {
+        this.baseUrl = baseUrl
+        this.configurationId = configurationId
+    }
+}
+
+export class NemoClient {
+    private readonly config: Config
+
+    constructor(baseUrl: string, configurationId: string) {
+        this.config = new ClientConfig(baseUrl, configurationId)
+    }
+
+    getRoleFromMessage(message: BaseMessage): string {
+        if (message instanceof HumanMessage || message instanceof SystemMessage) {
+            return 'user'
+        }
+
+        //AIMessage, ToolMessage, FunctionMessage
+        return 'assistant'
+    }
+
+    getContentFromMessage(message: BaseMessage): string {
+        return message.content.toString()
+    }
+
+    buildBody(messages: BaseMessage[], configurationId: string): any {
+        const bodyMessages = messages.map((message) => {
+            return {
+                role: this.getRoleFromMessage(message),
+                content: this.getContentFromMessage(message)
+            }
+        })
+
+        const body = {
+            config_id: configurationId,
+            messages: bodyMessages
+        }
+
+        return body
+    }
+
+    async chat(messages: BaseMessage[]): Promise<AIMessage[]> {
+        const headers = new Headers()
+        headers.append('Content-Type', 'application/json')
+
+        const body = this.buildBody(messages, this.config.configurationId)
+
+        const requestOptions = {
+            method: 'POST',
+            body: JSON.stringify(body),
+            headers: headers
+        }
+
+        return await fetch(`${this.config.baseUrl}/v1/chat/completions`, requestOptions)
+            .then((response) => response.json())
+            .then((body) => body.messages.map((message: any) => new AIMessage(message.content)))
+    }
+}