Module imports need to be removed for Objective-C++ compatibility (React Native 0.68+)

[shamilovtim]

The module imports are unnecessary and they create complications for Objective-C++:

If users add the flags for Objective-C++ modules it will break other dependencies in their projects. Could you please remove the module imports and use the header system like the rest of these files are already using?

Related: https://github.com/firebase/FirebaseUI-iOS/issues/875 https://github.com/facebook/react-native/issues/33692 https://github.com/invertase/react-native-firebase/pull/6223

[WYZEYaolongZhu]