support Android build of the maf factory and plugins

[nlsdvl]

v0.0.9 doesn't support media pipelines on Android.

Initial support can be added by compiling the MAF dependencies for Android, however decoding support will be limited to CPU decoding :

• Minor adjustments - runtime loading of MAF plugins - may be needed to the code source. To be confirmed.
• Mesa documentation is a good exemple of compilation for android using meson: https://docs.mesa3d.org/android.html?highlight=cross%20compile
• the ffmpeg/libav dependency needs to be updated to Android, FFmpeg-kit is one source of pre-compiled binaires : https://github.com/arthenica/ffmpeg-kit/tree/main/android
• Instead of providing pre-built binaries, developers will be invited to download or compile their own dependencies.

As a next step, HW decoding would be implemented and the unity player would be implemented to use buffers directly from the MAF pipeline.