consul: migrate formula to casks

[botantony]

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this formula was deprecated almost one year ago and yet it is still being used (see analytics) and some formulae use it as a dependency. i think it would be better to at least migrate this formula to casks rather than removing it from the official repo completely

p.s. for some reasons brew audit --cask --new consul prints consul is listed in tap_migrations.json despite being removed from the list

[bevanjkay]

Did you mean to remove the cask file on the latest force-push?

[botantony]

until this pr is not merged i do not think it is a good idea to create the cask version of this formula

[bevanjkay]

Happy to decouple this from adding the new formula, but the PR in homebrew-core also can't be merged until the target casks exists againhere.