rusk: embed verifier keys

[herr-seppia]

Summary

Every node need verifier data available to preverify transactions

This lead to node operators to download vd or to run rusk recovery keys to generate them (even if node is not used for proving)

Possible solution design or implementation

Embed VD and let user run rusk recovery keys only if needed by prover

Additional context

rusk recovery keys it's quite slow even if the keys are already generated. This is because the CRS is not in uncompressed format anymore (maybe worth to restore the old format)