[TIMOB-26532] Android: Add canRequestPackageInstalls to Ti.Android

Hi, this is a enhancement request for the Ti.Android SDK module. Since Android 8 (Oreo) when an app wants to install a APK (Update itself or another app) it requires some extra permission and steps as highlighted here: https://android-developers.googleblog.com/2017/08/making-it-safer-to-get-apps-on-android-o.html Part of that process is checking if the app currently has the settings enabled for "Install Unknown Sources" for the app - to check for this one uses "canRequestPackageInstalls" https://developer.android.com/reference/android/content/pm/PackageManager#canRequestPackageInstalls() This is not currently built into the Ti.Android SDK module to my knowledge (maybe I missed it?) I was able to get what I need with Hyperloop but it would be good if this was built into the SDK Here is my Hyperloop code:

var activity = require('android.app.Activity');
var currentActivity = new activity(Ti.Android.currentActivity);
var canRequestPackageInstalls = currentActivity.getPackageManager().canRequestPackageInstalls();
Ti.API.info("canRequestPackageInstalls");
Ti.API.info(canRequestPackageInstalls);

Can we get this added to the Ti.Android SDK Module?