Multi Transactions should be submitted in batch

[yanCode]

I've seen a common misconception in typescript clients for many soloana projects

• Please bear in mind, Solana supports batch processing transactions, in other words, as the long as these transcactions don't mutate the same account, they can be processed in batch, this is one important reason why solana is Faster.
• But code in many clients only await the first transcation completes then starts next transcation.
• As in the original code, it sequentially creates 3 mint, but in fact it doesn't have to wait for another.
• In fact, it's a very good sample to sumbit them together using some javascript functions such as Process.all
• This can shorten the overall executing time, even on local env, local-test-validator