feat(android): use EncryptedSharedPreferences

[m1ga]

fixes #13846

Adds Ti.App.Properties.useEncryption to store EncryptedSharedPreferences.

Test

Ti.App.Properties.setString("string", "plain value");
console.log("not encrypted - should be 'plain value': " + Ti.App.Properties.getString("string", "default"));

Ti.App.Properties.useEncryption = true;
Ti.App.Properties.setString("string", "secure value");
console.log("encrypted - should be 'secure value': " + Ti.App.Properties.getString("string", "default"));

Ti.App.Properties.useEncryption = false;
Ti.App.Properties.setString("string", "plain value 2");
console.log("not encrypted - should be 'plain value 2': " + Ti.App.Properties.getString("string", "default"));

Ti.App.Properties.useEncryption = true;
console.log("encrypted - should be 'secure value': " + Ti.App.Properties.getString("string", "default"));

Stores the values in an encrypted xml:

Todo

• Extend test
• Docs