🛠️ [EPIC] : Voting crate

[Mr-Leshiy]

Summary

Implement a voting Rust crate with all voting capabilities.

Description

• move original implementation of voting procedure from the catalyst-core repo
• make sure that it's aligned with the following spec https://input-output-hk.github.io/catalyst-voices/architecture/08_concepts/voting_transaction/crypto/.
• refactor it, to make a clean and easy API defined by this spec https://input-output-hk.github.io/catalyst-voices/architecture/08_concepts/voting_transaction/crypto/.

Tasks

• 🛠️ [TASK] : ElGamal encryption #34
• 🛠️ [TASK] : Tally implementation for catalyst-voting crate #37
• 🛠️ [TASK]: Tally proof for catalyst-voting #42
• 🛠️ [TASK]: Vote proof for catalyst-voting #46
• 🛠️ [TASK] : Jormungandr transaction builder #55
• Update sign tool to be able to build transaction using catalyst-voting crate catalyst-core#717