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/astro/src/bknd.ts

@@ -0,0 +1,23 @@
+import type { AstroGlobal } from "astro";
+import { getApp as getBkndApp } from "bknd/adapter/astro";
+import config from "../bknd.config";
+
+export { config };
+
+export async function getApp() {
+   return await getBkndApp(config);
+}
+
+export async function getApi(
+   astro: AstroGlobal,
+   opts?: { mode: "static" } | { mode?: "dynamic"; verify?: boolean },
+) {
+   const app = await getApp();
+   if (opts?.mode !== "static" && opts?.verify) {
+      const api = app.getApi({ headers: astro.request.headers });
+      await api.verifyAuth();
+      return api;
+   }
+
+   return app.getApi();
+}