(Bug fix) - Using include_usage for /completions requests + unit testing (#8484)

* pass stream options (#8419)

* test_completion_streaming_usage_metrics

* test_text_completion_include_usage

---------

Co-authored-by: Kaushik Deka <55996465+Kaushikdkrikhanu@users.noreply.github.com>

litellm/main.py

@@ -3947,6 +3947,7 @@ async def atext_completion(
                 ),
                 model=model,
                 custom_llm_provider=custom_llm_provider,
+                stream_options=kwargs.get('stream_options'),
             )
         else:
             ## OpenAI / Azure Text Completion Returns here