refactored adapters to run test suites (#126)

* refactored adapters to run test suites

* fix bun version for tests

* added missing adapter tests and refactored examples to use `bknd.config.ts` where applicable

examples/react-router/app/routes/api.$.ts

@@ -1,7 +1,7 @@
 import { getApp } from "~/bknd";
 
 const handler = async (args: { request: Request }) => {
-   const app = await getApp(args);
+   const app = await getApp();
    return app.fetch(args.request);
 };