feat(updater): add setting to disable automatic updates

[nicholas-ochoa]

Add a new setting that allows users to disable automatic updates

Fixes #3181

[setchy]

Thanks for contributing.

I'd like to explore, if possible, how we could better detect if it's installed via homebrew (i believe they already have this capability).

I'd really like to keep users as close to the latest mainline release. Is there something better we could offer than disabling auto updates completely?

[nicholas-ochoa]

Detecting if gitify was installed via Homebrew is possible. How do you feel about only showing the checkbox when a package manager install is detected?

I'm not sure about what other approaches can be taken, I'm open to any ideas on a different direction to take with this PR.

I'm just trying to solve my original issue with the frequent notifications popping up that are not needed (since Homebrew is updating it, in my case).