[MLOB-1009] Auto-Instrument LLM Observability (#500)

* add force flush

* add enable to init

* move flush to after parent aws span finishes

* move flushing to be with other flushes

datadog_lambda/wrapper.py

@@ -54,6 +54,10 @@
 if profiling_env_var:
     from ddtrace.profiling import profiler
 
+llmobs_env_var = os.environ.get("DD_LLMOBS_ENABLED", "false").lower() in ("true", "1")
+if llmobs_env_var:
+    from ddtrace.llmobs import LLMObs
+
 logger = logging.getLogger(__name__)
 
 DD_FLUSH_TO_LOG = "DD_FLUSH_TO_LOG"
@@ -221,6 +225,10 @@ def __init__(self, func):
             # Patch third-party libraries for tracing
             patch_all()
 
+            # Enable LLM Observability
+            if llmobs_env_var:
+                LLMObs.enable()
+
             logger.debug("datadog_lambda_wrapper initialized")
         except Exception as e:
             logger.error(format_err_with_traceback(e))
@@ -373,6 +381,9 @@ def _after(self, event, context):
                 # logs api
                 flush_extension()
 
+            if llmobs_env_var:
+                LLMObs.flush()
+
             if self.encode_authorizer_context and is_authorizer_response(self.response):
                 self._inject_authorizer_span_headers(
                     event.get("requestContext", {}).get("requestId")