Add new transaction validations

[elenabardho]

List of changes

• Add new validation checks
  -Check required signers in the transaction
  -Check transaction has one vote
  -Check there is no certificates in the transaction
  -Check if wallet and transaction are for the same network (mainnet || testnet)
  -Check if signature is part of the plutus data in output
  -Check if the ICC credentials are correct

[Ryun1]

Can we add also;

• IF a validation has failed, dont let the user press the sign button