Migrate to v2

This guide references the major changes between v1 and v2 to help those migrating an existing app.

GelatoRelayPack

• The GelatoRelayPack constructor now includes a mandatory protocolKit parameter. It's required for any new pack extending the RelayKitBasePack.

• We removed the protocolKit parameter from the createTransactionWithHandlePayment(), createTransactionWithTransfer(), and executeRelayTransaction() methods in the GelatoRelayPack as now it's included in the constructor.

• Removed the export interface RelayPack type as we now use an abstract class.