feat!: type auto-generation (#6657)

Types are now auto-generated by default.

You can opt-out of this behavior by setting:
```ts
buildConfig({
  // Rest of config
  typescript: {
    autoGenerate: false
  },
})
```

test/buildConfigWithDefaults.ts

@@ -160,12 +160,15 @@ export async function buildConfigWithDefaults(
     secret: 'TEST_SECRET',
     sharp,
     telemetry: false,
+
+    ...testConfig,
+
     typescript: {
       declare: {
         ignoreTSError: true,
       },
+      ...testConfig?.typescript,
     },
-    ...testConfig,
     i18n: {
       supportedLanguages: {
         de,