fix: add namespace to aos build gradle config

[OHHAKO]

Hello. Thanks for maintaining this repo.

I just added namespace only for AOS. #390
i don't know there is PR template here. check please
this PR related to react-native-community/discussions-and-proposals#671

[1nspir3d]

A more proper fix would be like this:

def agpVersion = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION
if (agpVersion.tokenize('.')[0].toInteger() >= 7) {
    namespace "com.reactnativeimageresizer"
}

[ahinkle]

Any movement on this one? I would hate to abandon/main a fork of this package for such a simple thing.

[gh-clement-taboulot]

@OHHAKO Thx for the PR.
We will find someone next week at BAM to review it.