Do not store .cpp/.h files inside src/main/java - reactnativeblob (#34421)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/34421

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 reactnativeblob

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

Reviewed By: cipolleschi

Differential Revision: D38703092

fbshipit-source-id: 3d4391d8ee5587b199efa4001f68c6d4ed3ce2c2

ReactAndroid/src/main/java/com/facebook/react/modules/blob/BUCK

@@ -31,7 +31,7 @@ rn_android_library(
         react_native_target("java/com/facebook/react/bridge:bridge"),
         react_native_target("java/com/facebook/react/common:common"),
         react_native_target("java/com/facebook/react/module/annotations:annotations"),
-        react_native_target("java/com/facebook/react/modules/blob/jni:jni"),
+        react_native_target("jni/react/reactnativeblob:jni"),
         react_native_target("java/com/facebook/react/modules/network:network"),
         react_native_target("java/com/facebook/react/modules/websocket:websocket"),
     ],

ReactAndroid/src/main/jni/CMakeLists.txt

@@ -99,7 +99,8 @@ add_react_android_subdir(src/main/jni/react/jscexecutor)
 add_react_android_subdir(src/main/java/com/facebook/react/turbomodule/core/jni)
 add_react_android_subdir(src/main/jni/react/uimanager)
 add_react_android_subdir(src/main/jni/react/mapbuffer)
+add_react_android_subdir(src/main/jni/react/reactnativeblob)
 add_react_android_subdir(src/main/java/com/facebook/react/fabric/jni)
-add_react_android_subdir(src/main/java/com/facebook/react/modules/blob/jni)
 add_react_android_subdir(src/main/jni/react/hermes/reactexecutor)
 add_react_android_subdir(src/main/jni/react/hermes/instrumentation/)
+