fix: accept the precision loss prevention of js on time_unix_nano

see open-telemetry/opentelemetry-js#4062

src/service/traces/otlp_http.rs

@@ -277,7 +277,7 @@ pub async fn traces_json(
                         }
                         events.push(Event {
                             name: event.get("name").unwrap().as_str().unwrap().to_string(),
-                            _timestamp: event.get("timeUnixNano").unwrap().as_u64().unwrap(),
+                            _timestamp: get_uint_value(event.get("timeUnixNano").unwrap()),
                             attributes: event_att_map.clone(),
                         })
                     }