Implement binding to libkiwix bookmark saving/reading primitives

[kelson42]

This is necessary for Kiwix Android 3.8.0 ticket https://github.com/kiwix/kiwix-android/issues/3105

[mgautierfr]

This is already done (although not tested in the CI):

• https://github.com/kiwix/java-libkiwix/blob/main/lib/src/main/java/org/kiwix/libkiwix/Library.java#L45
• https://github.com/kiwix/java-libkiwix/blob/main/lib/src/main/java/org/kiwix/libkiwix/Library.java#L57-L59
• https://github.com/kiwix/java-libkiwix/blob/main/lib/src/main/java/org/kiwix/libkiwix/Manager.java#L58