Do not store .cpp/.h files inside src/main/java - fabricjni

[cortinico]

Summary:
Currently we expose native code (.h, .cpp) inside the src/main/java folder.
This is making impossible for users on New Architecture to open the project
inside Android Studio.

The problem is that the src/main/java is reserved to Java/Kotlin sources only.
AGP 7.2 also removed support for mixed source roots:
https://developer.android.com/studio/releases/gradle-plugin#duplicate-content-roots

This is essentially forcing users to write Java code without any autocompletion
as all the React Native Java classes are considered C++ files.

I'm addressing this issue folder by folder by moving them
from ReactAndroid/src/main/java/com/facebook/... to ReactAndroid/src/main/jni/react/...

This is the diff for fabricjni

Changelog:
[Internal] [Changed] - Do not store .cpp/.h files inside src/main/java - fabricjni

Reviewed By: cipolleschi

Differential Revision: D38741130

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D38741130

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,613,899	-6
android	hermes	armeabi-v7a	7,028,904	-12
android	hermes	x86	7,914,354	-31
android	hermes	x86_64	7,888,296	+11
android	jsc	arm64-v8a	9,492,866	+8
android	jsc	armeabi-v7a	8,270,746	-11
android	jsc	x86	9,430,919	-29
android	jsc	x86_64	10,023,957	+13

Base commit: ba383ba
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 163636d
Branch: main

[react-native-bot]

This pull request was successfully merged by @cortinico in 4706d13.

^{When will my fix make it into a release? | Upcoming Releases}