Add supports for RN 0.71

[focux]

Starting from version 0.71, react native is not shipping the android folder (read more).

This library depends on the android folder to build correctly, so this PR adds support for 0.71 and above and it's not backward compatible with older versions. ⚠️ This is a breaking change.

DISCLAIMER: These changes were extracted from react-native-mmkv library, all credits to them.

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Name	Status	Preview	Comments	Updated
rnmmkv	❌ Failed (Inspect)			Jan 18, 2023 at 3:50PM (UTC)

[robrechtme]

Even with the changes of @JerakRus I'm still getting build errors:

Execution failed for task ':app:mergeDebugNativeLibs'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.MergeNativeLibsTask$MergeNativeLibsTaskWorkAction
   > 2 files found with path 'lib/arm64-v8a/libjsi.so' from inputs:
      - /Users/robrechtme/code/my-app/node_modules/react-native-mmkv-storage/android/build/intermediates/library_jni/debug/jni/arm64-v8a/libjsi.so
      - /Users/robrechtme/.gradle/caches/transforms-3/9f48c0d87a8aa7490b90e5b452e6d297/transformed/jetified-react-android-0.71.0-debug/jni/arm64-v8a/libjsi.so
     If you are using jniLibs and CMake IMPORTED targets, see
     https://developer.android.com/r/tools/jniLibs-vs-imported-targets

[focux]

Fixed all the build issues and upgraded the example project to v0.71 as well to be sure that is working well on Android and iOS.

[JamesC159]

Fixed all the build issues and upgraded the example project to v0.71 as well to be sure that is working well on Android and iOS.

confirmed the build works now. App did not crash either

[ammarahm-ed]

Although this PR is great, the problem is that it won't work for older versions of this library after upgrading. It still has to be backward compatible some how because most projects are on older versions of react-native & we are still supporting both.

So we need to find a way to still keep it backward compatible.

[mmmoussa]

This PR has duplicated mrousavy/react-native-mmkv#480 and mrousavy/react-native-mmkv#499 without mentioning that and has carried over a few changes that are not relevant to this library. I've flagged two but there may be others that I missed given my unfamiliarity with the build process.