Add NiProof struct in zk enc: paillier encryption in range#156

survived merged 1 commit intoLFDT-Lockness:cggmp24/mLFDT-Lockness/cggmp21:cggmp24/mfrom

jfdreis:refactor/NiProofs_encjfdreis/cggmp21:refactor/NiProofs_encCopy head branch name to clipboard