Moving to PolygonID's stack on Android

[0xturboblitz]

This is preliminary work on moving to PolygonID's stack on Android. This is not necessary right now as mopro works well on Android for us, and the blocker was doing a release on iOS.

• I fixed fr_raw_generic.cpp dirtily by typecasting, which might have broken witness calculation. => As suggested by their team, look at this build script to understand why it doesn't build well on my side.

• At the zkey loading step, it says: Could not invoke Prover.runProveAction java.lang.OutOfMemoryError: Failed to allocate a 268435472 byte allocation with 25165824 free bytes and 115MB until OOM, target footprint 172835488, growth limit 268435456 => Looks like android:largeHeap="true" does not solve, turns into: Caused by: java.lang.OutOfMemoryError: Failed to allocate a 536870928 byte allocation with 25165824 free bytes and 242MB until OOM, target footprint 307414080, growth limit 536870912 => no trivial solution but look at the react-native-rapidsnark update they pushed

• It looks from here that we should create a cpp wrapper and build it with CMake. This is necessary to have function names compliant with JNI and also typecasting correctly. Right now I have trouble doing that.

• Typing of inputs in ProverModule.kt probably incorrect

[0xturboblitz]

fixed 1 using the team's fix https://github.com/0xPolygonID/witnesscalc/issues/25, 2 using groth16ProveWithZKeyFilePath from react-native-rapidsnark, and 3 et 4 were fine