add id getter for processors

internal/processor/test/http-response-create_test.go

@@ -16,6 +16,7 @@ func TestHTTPResponseCreateFromRegistry(t *testing.T) {
 	}
 
 	processorInstance, err := registration.New(config.ProcessorConfig{
+		Id:   "test-id",
 		Type: "http.response.create",
 		Params: map[string]any{
 			"status":       200,
@@ -27,6 +28,10 @@ func TestHTTPResponseCreateFromRegistry(t *testing.T) {
 		t.Fatalf("failed to create http.response.create processor: %s", err)
 	}
 
+	if processorInstance.Id() != "test-id" {
+		t.Fatalf("http.response.create processor has wrong id: %s", processorInstance.Id())
+	}
+
 	if processorInstance.Type() != "http.response.create" {
 		t.Fatalf("http.response.create processor has wrong type: %s", processorInstance.Type())
 	}