New Catalyst Voting to the `gateway`

[Mr-Leshiy]

Summary

Integrate the most recent updates from the catalyst-signed-doc and catalyst-contest crates for the cat-gateway.

Description

• Properly update cat-gateway with the latest catalyst-signed-doc and catalyst-contest crates versions.
• Enable validation logic for the following documents:
  • Contest Ballot
  • Contest Parameters
  • Contest Delegation
  • Rep Nomination