Drop Old Architecture Support

[mym0404]

From ❄️ Freezing the Legacy Architecture, any pull request against React Native Old Architecture won't be accepted.

Furthermore, the maintaining resources required to support both architecture makes react-native-kakao somewhat unstable.

We are going to drop support old architecture soon. Please migrate your project to New architecture incrementally. Otherwise, it doesn't mean you cannot use react-native-kakao totally on old architectur. You can with published releases supporting old architecture.