Implement main class & fetch function - including robust error handling.

src/clients/LdbClientV2.ts

@@ -0,0 +1,9 @@
+import { BaseOwlBoardClient } from "./client";
+
+export class LdbClientV2 {
+    private client: BaseOwlBoardClient;
+
+    constructor(client: BaseOwlBoardClient) {
+        this.client = client;
+    }
+}