[TIMOB-24218] Android: Expose Keychain access in Ti.TouchID (Parity with iOS)

   var TouchID = require('ti.touchid');
       keychainItem = TouchID.createKeychainItem({
           identifier: 'test_key',
           //cipher: 'AES/CBC/PKCS7Padding',
           accessControlMode: TouchID.ACCESS_CONTROL_TOUCH_ID_ANY
       }),
       win = Ti.UI.createWindow({backgroundColor: 'white', layout: 'vertical'});
       queue = [],
       callback = function(e) {
           if (queue.length) {
               queue.shift().close();
           }
           alert(JSON.stringify(e, null, 2));
       };
   
   keychainItem.addEventListener('save', callback);
   keychainItem.addEventListener('read', callback);
   
   button('SAVE', function() {
       showFingerprint();
       keychainItem.save('test');
   });
   button('READ', function() {
       showFingerprint();
       keychainItem.read();
   });
   
   win.open();
   
   function showFingerprint() {
       if (keychainItem.accessControlMode !== TouchID.ACCESS_CONTROL_TOUCH_ID_ANY) return;
       var win = Ti.UI.createWindow({backgroundColor: 'white'}),
           img = Ti.UI.createImageView({image: 'http://bit.ly/2ur2X4u', width: 64, height: 64});
       queue.push(win);
       win.add(img);
       win.open();
   }
   function button(title, click) {
       var btn = Ti.UI.createButton({title: title, width: Ti.UI.FILL});
       btn.addEventListener('click', click);
       win.add(btn);
   }