fix(android/engine): Increase robustness when checking package kmp.json languages

[darcywong00]

Fixes #11812

This adds more error handling to JSONUtils.getLanguages() where the reported issue had crashed from

Exception java.lang.NullPointerException: Attempt to get length of null array

Also added a unit test.

@keymanapp-test-bot skip

[keymanapp-test-bot[bot]]

User Test Results

Test specification and instructions

User tests are not required

Test Artifacts

• Android
  • Keyman for Android apk
  • FirstVoices for Android 16.0 apk
  • FirstVoices Keyboards for Android apk
  • KeyboardHarness apk
  • Keyman for Android 16.0 apk
  • KMSample1 apk
  • KMSample2 apk

[keyman-server]

Changes in this pull request will be available for download in Keyman version 18.0.130-alpha