setFunction

open fun setFunction(builderForValue: Builder): Aptos.ManagedTokensRegisterMessage.Builder
token function to register, e.g BTC: 0x43417434fd869edee76cca2a4d2301e528a1551b1d719b75c350c3c97d15b8b9::coins::BTC
.TW.Aptos.Proto.StructTag function = 1;