Add priority fees to token transfers.

[ke6jjj]

No description provided.

[ke6jjj]

Going to mark this as draft. There are a couple of likely issues:

1. The CU estimation assumes that all the transfers are SPL transfers, even if some of them are straight native SOL transfers. The CU estimation will probably have to be done inside the loop as an accumulator, rather than outside the loop as a multiply.
2. The number of CU to execute a CreateIdempotent insn is likely higher than the 5k estimated.