Add database name to span name

Author: amitsetty

instrumentation/opentelemetry-instrumentation-pymongo/src/opentelemetry/instrumentation/pymongo/__init__.py

@@ -121,7 +121,7 @@ def started(self, event: monitoring.CommandStartedEvent):
         ):
             return
         command = event.command.get(event.command_name, "")
-        name = event.command_name
+        name = f"{event.database_name}.{event.command_name}" if event.database_name else event.command_name
         statement = event.command_name
         if command:
             statement += " " + str(command)