Rd 5479 add flag to use tracer extension (#200)

* RD-5479
create extensions api in tracer

Author: OrrLumigo

src/lumigo_tracer/lumigo_utils.py

@@ -314,6 +314,7 @@ def report_json(region: Optional[str], msgs: List[dict], should_retry: bool = Tr
         return 0
     if should_use_tracer_extension():
         with lumigo_safe_execute("report json file: writing spans to file"):
+            get_logger().debug("Using tracer extension")
             write_spans_to_file(to_send)
         return 0
     if region == CHINA_REGION:

src/lumigo_tracer/spans_container.py

@@ -24,6 +24,7 @@
     get_region,
     is_provision_concurrency_initialization,
     get_stacktrace,
+    should_use_tracer_extension,
 )
 from lumigo_tracer import lumigo_utils
 from lumigo_tracer.parsing_utils import parse_trace_id, safe_split_get, recursive_json_join
@@ -115,7 +116,7 @@ def _generate_start_span(self) -> dict:
 
     def start(self, event=None, context=None):
         to_send = self._generate_start_span()
-        if not Configuration.send_only_if_error:
+        if not Configuration.send_only_if_error and not should_use_tracer_extension():
             report_duration = lumigo_utils.report_json(region=self.region, msgs=[to_send])
             self.function_span["reporter_rtt"] = report_duration
         else: