PaymasterAPI
an API to external a UserOperation with paymaster info
class PaymasterAPI {}
function getPaymasterAndData(  userOp: Partial<UserOperationStruct>,
the value to put into the PaymasterAndData, undefined to leave it empty
an API to external a UserOperation with paymaster info
class PaymasterAPI {}
function getPaymasterAndData(  userOp: Partial<UserOperationStruct>,
the value to put into the PaymasterAndData, undefined to leave it empty