feat: Log a stream's bookmark (if it's avaiable) when its sync starts (#2775)

Author: edgarrmondragon

singer_sdk/streams/core.py

@@ -440,6 +440,8 @@ def _write_starting_replication_value(self, context: types.Context | None) -> No
                 else:
                     value = self.compare_start_date(value, start_date_value)
 
+            self.logger.info("Starting incremental sync with bookmark value: %s", value)
+
         write_starting_replication_value(state, value)
 
     def get_replication_key_signpost(