add id getter for processors

internal/processor/test/db-query_test.go

@@ -18,6 +18,7 @@ func TestDbQueryFromRegistry(t *testing.T) {
 	}
 
 	processorInstance, err := registration.New(config.ProcessorConfig{
+		Id:   "test-id",
 		Type: "db.query",
 		Params: map[string]any{
 			"module": "test",
@@ -28,6 +29,10 @@ func TestDbQueryFromRegistry(t *testing.T) {
 		t.Fatalf("failed to create db.query processor: %s", err)
 	}
 
+	if processorInstance.Id() != "test-id" {
+		t.Fatalf("db.query processor has wrong id: %s", processorInstance.Id())
+	}
+
 	if processorInstance.Type() != "db.query" {
 		t.Fatalf("db.query processor has wrong type: %s", processorInstance.Type())
 	}