fix(types): add missing ServiceDB interface

any property of `type: "$.service.db"` becomes an instance of `ServiceDB` at runtime.

Author: joscha

types/src/index.ts

@@ -247,6 +247,11 @@ export interface ServiceDBProp extends BasePropInterface {
   type: "$.service.db";
 }
 
+export interface ServiceDB {
+  get<T extends JSONValue>(key: string): T | undefined;
+  set(key: string, value: JSONValue): void;
+}
+
 // https://pipedream.com/docs/code/nodejs/using-data-stores/#using-the-data-store
 export interface DataStoreProp extends BasePropInterface {
   type: "data_store";