refactor: add resetAdapter method to ResourceFetcher

Add explicit resetAdapter() method to ResourceFetcher class for cleaner API.
- Add resetAdapter() static method that sets adapter to null
- Update cleanupExecutorch() to use resetAdapter() instead of type assertion hack
- Update error message to reference new package names (@react-native-executorch/*)

This provides a cleaner, type-safe way to reset the adapter without
requiring "null as unknown as ResourceFetcherAdapter" type assertion.

Author: rizalibnu

packages/react-native-executorch/src/index.ts

@@ -13,7 +13,7 @@ export function initExecutorch(config: ExecutorchConfig) {
 }
 
 export function cleanupExecutorch() {
-  ResourceFetcher.setAdapter(null as unknown as ResourceFetcherAdapter);
+  ResourceFetcher.resetAdapter();
 }
 
 // eslint-disable no-var

packages/react-native-executorch/src/utils/ResourceFetcher.ts

@@ -60,11 +60,15 @@ export class ResourceFetcher {
     this.adapter = adapter;
   }
 
+  static resetAdapter() {
+    this.adapter = null;
+  }
+
   static getAdapter(): ResourceFetcherAdapter {
     if (!this.adapter) {
       throw new RnExecutorchError(
         RnExecutorchErrorCode.NotImplemented,
-        'ResourceFetcher adapter is not initialized. Please call initExecutorch({ resourceFetcher: ... }) with a valid adapter, e.g., from @rn-executorch/expo-adapter or @rn-executorch/bare-adapter.'
+        'ResourceFetcher adapter is not initialized. Please call initExecutorch({ resourceFetcher: ... }) with a valid adapter, e.g., from @react-native-executorch/expo-resource-fetcher or @react-native-executorch/bare-resource-fetcher.'
       );
     }
     return this.adapter;