Support Homebrew via a `tap`

[timsearle]

As outlined in GHLint docs, Homebrew has very stringent requirements for new formulae, which may not be met and could potentially be very arbitrary.

A sensible alternative would be to provide it via a tap. This would require a repository at TWiStErRob/homebrew-tap, with a Formulae directory and reference GHLint within the ruby file.

Docs: https://docs.brew.sh/How-to-Create-and-Maintain-a-Tap

[TWiStErRob]

Example: https://github.com/JakeWharton/diffuse?tab=readme-ov-file#install https://github.com/JakeWharton/homebrew-repo/tree/trunk/Formula