Migrate com.facebook.react.packagerconnection interfaces to Kotlin (#49025)

Summary:
Migrate com.facebook.react.packagerconnection interfaces to Kotlin. Also, moving to `org.mockito.kotlin` instead of `org.mockito.Mockito` for JSPackagerClientTest to make it compatible with the migrated files.

## Changelog:

[INTERNAL] - Migrate com.facebook.react.packagerconnection interfaces to Kotlin

Pull Request resolved: https://github.com/facebook/react-native/pull/49025

Test Plan:
```bash
yarn test-android
yarn android
```

Reviewed By: cortinico, Abbondanzo

Differential Revision: D68842336

Pulled By: tdn120

fbshipit-source-id: c3062675b5535277970fd97490720739fc748f2a