Make the frodokem pass the SCT check

[potsrevennil]

This PR uses the latest available instructions like #spill, #unspill, #spill_to_mmx, and make the FrodoKem reference implementation pass the SCT check.

The implementation is also refactored into indcpa and kem functions as well.

I merged main branch into this PR, since frodokem branch haven't been updated for a long time, I figure it would better to keep up to date with the main branch.