feat: migrate from TypeORM to Drizzle ORM

- Migrate fixtures script to use Drizzle ORM
- Refactor Book resolver to use Drizzle ORM

Author: amalv

drizzle.config.ts

@@ -0,0 +1,19 @@
+import { config } from "dotenv";
+import type { Config } from "drizzle-kit";
+
+const envPath =
+  process.env.NODE_ENV === "production" ? ".env.production" : ".env.local";
+
+config({ path: envPath });
+
+export default {
+  schema: "./src/schema.ts",
+  out: "./drizzle",
+  driver: "pg",
+  dbCredentials: {
+    host: process.env.DB_ENDPOINT,
+    user: process.env.DB_USER,
+    password: process.env.DB_PASSWORD,
+    database: process.env.DB_NAME,
+  },
+} satisfies Config;