cli: make set-mint-authority a top-level command with chain parameter support

[evgeniko]

in preparation for other SVM chains being supported by the CLI. So far the default was Solana

[nvsriram]

Currently the set-mint-authority function only applies to SVM so I don't think it should be made top-level.

I'm not super familiar with Fogo tooling but seeing as the function itself does not have any major changes, I'll assume it has similar tooling. Is there a reason we want to move the set-mint-authority command up rather just rename the solana command to svm? Do some solana subcommands not apply to Fogo?

[kcsongor]

I think the main benefit of doing this is so we can support other runtimes down the line other than SVM under the same command. It would be neat if we could set up a token on a new chain in a platform agnostic way (as far as the CLI interface is concerned). That said, this command should error for now if the platform is not SVM

[kcsongor]

59b6e78 here's a branch I started which has some overlap, but should show the general direction

[evgeniko]

I added the svm error. I would like to keep this PR separate from the branch you created @kcsongor, just to have less code to review.

[nvsriram]

I believe as a consequence, the original helper function would also need to be renamed to checkSvmValidSplMultisig along with all other references of it in this file.

[nvsriram]

LGTM!