[Feature Request] Add support for latest version of EIP-712

[john-light]

Sovryn recently released support for limit orders for its spot and margin trading protocols. Sovryn limit orders use EIP-712 messages to enable users to trustlessly pre-commit to orders at a particular price level. Many Sovryn users are also Liquality users, and Liquality does not yet support EIP-712, meaning these users will either not be able to place limit orders, or they will need to use a different wallet.

Info:

• https://eips.ethereum.org/EIPS/eip-712
• https://docs.metamask.io/guide/signing-data.html#sign-typed-data-v4

[mrigali]

This would be a nice enhancement to Liquality!