feat(android): androidX support (#7039)

* feat: migrate support library namespaces to androidX

* feat(tns-platform-declarations): update to androidX typings

* chore(tests): migrate test apps to AndroidX

* chore(tns-platform-declarations): update tsconfig to include androidx dts files

* update package.json to androidx

* chore(androidx): migrate forgotten support library namspaces

* feat(tns-core-modules-widgets): migrate to AndroidX namespaces

* chore(utils): update androidx namspace for getPaletteColor method

* chore(apps): update tns-platform-declarations package

* Update package.json

apps/app/App_Resources/Android/AndroidManifest.xml

@@ -29,7 +29,7 @@
 		<meta-data android:name="debugLayouts" android:value="true" />
 
 		<provider
-			android:name="android.support.v4.content.FileProvider"
+			android:name="androidx.core.content.FileProvider"
 			android:authorities="org.nativescript.apps.provider"
 			android:exported="false"
 			android:grantUriPermissions="true">

apps/app/App_Resources/Android/app.gradle

@@ -14,3 +14,4 @@ android {
     additionalParameters "--no-version-vectors"  
   }  
 } 
+project.ext.useAndroidX=true