Set a soft rate limit threshold and show current rate limit budget

[bryanhuhta]

📝 Provide a description of the new feature

I think Gitfy sometimes gobbles up a lot of my rate limit budget and this impacts me when I'm simultaneously developing against the GitHub API. My current solution is to make an API request with the same PAT as Gitify and check the rate limit header myself. If I'm close (or out) I disable Gitify.

It would be nice to be able to set a soft limit in the app where no more API calls are made if this limit is reached. Additionally, it would be nice to see the remaining rate limit budget I have left directly in the Gitify UI.

➕ Additional Information

We could, for example, put the rate limit info in the side bar:

Alternatively, it could live in the settings menu near the bottom: