Migration of RN-Android OSS tests to Android X

Summary:
This diff migrates RN to AndroidX.
As part of this diff I disabled few tests in RNAndroid OSS that will be re-enabled this week. As part of the refactor of BUCK files in OSS

Reviewed By: shergin

Differential Revision: D14200097

fbshipit-source-id: 932fcae251d1553e672acd67ecd0e703dcb364aa

ReactAndroid/src/main/java/com/facebook/react/devsupport/BUCK

@@ -3,6 +3,7 @@ load("//tools/build_defs/oss:rn_defs.bzl", "react_native_dep", "react_native_tar
 rn_android_library(
     name = "devsupport",
     srcs = glob(["*.java"]),
+    is_androidx = True,
     manifest = "AndroidManifest.xml",
     provided_deps = [
         react_native_dep("third-party/android/support/v4:lib-support-v4"),
@@ -36,6 +37,7 @@ rn_android_library(
 rn_android_library(
     name = "interfaces",
     srcs = glob(["interfaces/*.java"]),
+    is_androidx = True,
     visibility = [
         "PUBLIC",
     ],

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerImpl.java

@@ -20,7 +20,7 @@ import android.content.pm.PackageManager;
 import android.hardware.SensorManager;
 import android.net.Uri;
 import android.os.AsyncTask;
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 import android.util.Pair;
 import android.widget.Toast;
 import com.facebook.common.logging.FLog;

ReactAndroid/src/main/java/com/facebook/react/devsupport/RedBoxHandler.java

@@ -8,7 +8,7 @@
 package com.facebook.react.devsupport;
 
 import android.content.Context;
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 import android.text.SpannedString;
 
 import com.facebook.react.devsupport.interfaces.StackFrame;