* Upgraded the gradle to support the Android 14.
* Made the changes in code to adapt the new gradle.
* Rectify the deprecated code that are not working in new version of gradle.
This mainly do:
- move `src/wrapper/java` into `lib/src` (and remove `src/wrapper`)
- create `lib/src/cpp` and move all `*.(cpp|h)` in it
- move all gradle stuff in `android-kiwix-lib-publisher` into `.`
- remove `android-kiwix-lib-publisher`