Make the distinction between a "Gnosis Multisig" and "Safe" [proposal viaType](https://github.com/OpenZeppelin/defender-sdk/blob/40c06ed02c4239ead059551c941de62ab2eef4f0/packages/proposal/src/models/proposal.ts#L20) more clear.
Make the distinction between a "Gnosis Multisig" and "Safe" proposal viaType more clear.