fix: add prefabs to hermes-engine & remove

[kewde]

Summary

• ditch the cppruntime - it's never used by our react native impl & original hermes version doesn't ship it either
• add prefabs to the AAR because react-native-reanimated and friends that rely on the hermes-engine dependency being available in CMake through prefabs.

TODO:

• .aar file should contain prefabs folder
• with name "hermes-engine" inside the prefab.json
• the libs/ shipped should be of the same size as the ones shipped on Maven by official build edit: we need to strip the prefab libraries they're fat with symbols

Test Plan

• npm package works with reanimated 3 in a production build

[alexandrius]

utACK thanks