feat: Add logic for handling async httpx requests

Signed-off-by: Varsha GS <varsha.gs@ibm.com>

Author: GSVarsha

src/instana/instrumentation/httpx.py

@@ -93,6 +93,35 @@ def handle_request_with_instana(
                 span.record_exception(e)
             else:
                 return response
+            
+    @wrapt.patch_function_wrapper("httpx", "AsyncHTTPTransport.handle_async_request")
+    async def handle_async_request_with_instana(
+        wrapped: Callable[..., "httpx.AsyncHTTPTransport.handle_async_request"],
+        instance: httpx.AsyncHTTPTransport,
+        args: Tuple[int, str, Tuple[Any, ...]],
+        kwargs: Dict[str, Any],
+    ) -> httpx.Response:
+        # If we're not tracing, just return
+        if tracing_is_off():
+            return await wrapped(*args, **kwargs)
+
+        tracer, parent_span, _ = get_tracer_tuple()
+        parent_context = parent_span.get_span_context() if parent_span else None
+
+        with tracer.start_as_current_span(
+            "httpx", span_context=parent_context, kind=SpanKind.CLIENT
+        ) as span:
+            try:
+                request = args[0]
+                _set_request_span_attributes(span, request)
+                tracer.inject(span.context, Format.HTTP_HEADERS, request.headers)
+
+                response = await wrapped(*args, **kwargs)
+                _set_response_span_attributes(span, response)
+            except Exception as e:
+                span.record_exception(e)
+            else:
+                return response
 
     logger.debug("Instrumenting httpx")
 except ImportError: