chore: export token transfer builder

Ticket: WIN-7155

Author: yash-bitgo

modules/sdk-coin-tao/src/lib/index.ts

@@ -9,6 +9,7 @@ export {
 } from '@bitgo/abstract-substrate';
 
 export { TransactionBuilderFactory } from './transactionBuilderFactory';
+export { TokenTransferBuilder } from './tokenTransferBuilder';
 export { TransferBuilder } from './transferBuilder';
 export { StakingBuilder } from './stakingBuilder';
 export { UnstakeBuilder } from './unstakeBuilder';