consul: migrate formula to casks

[botantony]

Important: Do not tick a checkbox if you haven’t performed its action. Honesty is indispensable for a smooth review process.

In the following questions <cask> is the token of the cask you're submitting.

After making any changes to a cask, existing or new, verify:

• The submission is for a stable version or documented exception.
• brew audit --cask --online <cask> is error-free.
• brew style --fix <cask> reports no offenses.

Additionally, if adding a new cask:

• Named the cask according to the token reference.
• Checked the cask was not already refused (add your cask's name to the end of the search field).
• brew audit --cask --new <cask> worked successfully.
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• brew uninstall --cask <cask> worked successfully.

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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

[botantony]

ok, now i get it