feat: add missing Device IO operations and fix formatting

- Add GetVideoOutputConfiguration operation
- Add GetVideoOutputConfigurationOptions operation
- Add SetVideoOutputConfiguration operation
- Add GetRelayOutputOptions operation
- Add comprehensive tests for new operations
- Add CLI support for new Device IO operations
- Fix gofmt formatting issues in all files

event.go

@@ -776,4 +776,3 @@ func splitSpaceSeparated(s string) []string {
 
 	return result
 }
-

event_test.go

@@ -736,4 +736,3 @@ func TestSetEventEndpoint(t *testing.T) {
 		t.Errorf("Expected event endpoint %s, got %s", newEndpoint, endpoint)
 	}
 }
-

examples/test-event-deviceio/main.go

@@ -233,4 +233,3 @@ func testDeviceIOService(ctx context.Context, client *onvif.Client) {
 		}
 	}
 }
-