Fix getUUID and URIUtil re-exports

[renchap]

getUUID and URIUtil are default exports, you need to use the export * as … syntax to re-exports them.

As noted in #136 which made this (incorrect) change, those 2 exports never worked and do not appear in type definitions, so maybe the correct fix is to remove them entirely?

I spotted this by using https://microsoft.github.io/rnx-kit/docs/tools/metro-serializer-esbuild in my project, which uses esbuild to optimise the bundle code, and it error-ed because of this invalid export.

This PR fixes the issue when tested locally with my setup, but again those 2 exports probably never worked so I dont think anybody used them.

[flyskywhy]

No, even this PR can fix react-native-web product build will export 'URIUtil' (reexported as 'URIUtil') was not found, but this PR will cause error when react-native run android:

error: node_modules/react-native-blob-util/index.js: /home/SOME_APP/node_modules/react-native-blob-util/index.js: Export namespace should be first transformed by `@babel/plugin-proposal-export-namespace-from`.
  57 |
  58 | export {ReactNativeBlobUtilConfig, ReactNativeBlobUtilResponseInfo, ReactNativeBlobUtilStream} from './types';
> 59 | export * as URIUtil from './utils/uri';
     |        ^^^^^^^^^^^^
  60 | export {FetchBlobResponse} from './class/ReactNativeBlobUtilBlobResponse';
  61 | export * as getUUID from './utils/uuid';
  62 | export default {

So comes the #201