Suggestion: Add new authority for 'spl-token withdraw-excess-lamports'

[chudleigh2]

This may be a pointless request but if you don't ask, you don't get.

I believe the authority to withdraw excess lamports from a program owned account for SPL 2022 is set with Minth Authority.

Almost all tokens created will revoke the Mint Authority making this a pointless CLI command. I appreciate there are already a lot of authorities but but surely one more can't hurt?

Whether it's even possible to change this now is beyond me but doing so would make a huge amount of people happy.