App Center Retirement: Redirect appcast url

[mortenjust]

Describe the solution you'd like
An option to permanently redirect an AppCenter Sparkle feed URL to another URL.

Describe alternatives you've considered
There are no alternatives.

Additional context
This is for macOS apps that use AppCenter's Sparkle features to update their app. It works by adding an SUFeedURL to info.plist. This URL is is a api.appcenter.ms url, which I assume will stop working.

This leaves hundreds of thousands of users unable to update, potentially leading to loss in revenue and brand damage.