[native] [5/40] RN 0.70: Update Folly on Android

Summary:
Inspired by expo-modules-core's approach – see details here. Not only does this allow us to update Folly, but it also lets us use C++17 finally!! Also critical for react-native-codegen update, and potentially unblocks NDK update (so we can use one that is M1-optimized).

Depends on D5898

Test Plan: Tested along with whole stack: test plan

Reviewers: tomek, bartek

Subscribers: atul

Differential Revision: https://phab.comm.dev/D5899