Added openai llm engine

sia/__main__.py

@@ -5,11 +5,11 @@ import asyncio
 import mimetypes
 import time
 
-
 from .config import Config
 from .hf_llm_engine import HfLlmEngine
 from .llm_engine import LlmEngine
 from .local_llm_engine import LocalLlmEngine
+from .openai_llm_engine import OpenAILlmEngine
 from .response_parser import ResponseParser
 from .system_metrics import SystemMetrics
 from .web_agent import WebAgent
@@ -50,6 +50,11 @@ class Main:
                     model_id=self._config.model,
                     api_token=self._config.api_token
                 )
+            case "openai":
+                self._llm = OpenAILlmEngine(
+                    model=self._config.model,
+                    api_key=self._config.api_token
+                )
             case "test":
                 self._llm = TestLLM()
             case _: