Update Notifications

### Feature Description

Alert the user of what plugins need to be updated

### Why is this feature needed?

No way to detect which can be updated atm.

### Additional Info

@MLGPenguin We need to talk about how we want to do this. I am concerned about our servers becoming flooded with requests every time a server checks. Doesn't help that 500 servers+ will be checking this once everyone updates

No files, tests, or entry points are named. First resolve the notification behavior and update-check request strategy with @MLGPenguin, including how to avoid flooding servers. Done means the project specifies which plugins need updates and how users are alerted without excessive requests.

Written by the indexing model from the issue text.