cli: interactive `rad publish`
Since rad publish is an irreversible action, add a confirmation flow
to make sure the user is asked if they are sure before running.
The confirmation prompt looks like:
?
! rad:z4ZMHfa9vubWdx7bkRBaRxgZwFBtW is about to be made public which makes it available to the Radicle network.
! Are you sure you want to make rad:z4ZMHfa9vubWdx7bkRBaRxgZwFBtW public? (Y/n)
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