fix: Remove Flow from @react-native/assets-registry's registry.js

## React native shipping Flow types breaks universal apps

See:

expo/expo#21623 (comment)

expo/expo#21623 (comment)

expo/expo#21469 (comment)

packages/assets/registry.js

@@ -4,34 +4,20 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @flow strict
  * @format
  */
 
 'use strict';
 
-export type PackagerAsset = {
-  +__packager_asset: boolean,
-  +fileSystemLocation: string,
-  +httpServerLocation: string,
-  +width: ?number,
-  +height: ?number,
-  +scales: Array<number>,
-  +hash: string,
-  +name: string,
-  +type: string,
-  ...
-};
+const assets = [];
 
-const assets: Array<PackagerAsset> = [];
-
-function registerAsset(asset: PackagerAsset): number {
+function registerAsset(asset) {
   // `push` returns new array length, so the first asset will
   // get id 1 (not 0) to make the value truthy
   return assets.push(asset);
 }
 
-function getAssetByID(assetId: number): PackagerAsset {
+function getAssetByID(assetId) {
   return assets[assetId - 1];
 }