10596: internal: Set server status to warning when proc-macro sources change r=Veykril a=Veykril Fixes https://github.com/rust-analyzer/rust-analyzer/issues/10027 ![image](https://user-images.githubusercontent.com/3757771/138102552-208d3edf-a843-49e6-9f48-1e911f54a4ba.png) It feels wrong using the database in this part of the code, but this was the only way to figure out whether a file belongs to a proc-macro that I could think of. Co-authored-by: Lukas Wirth <lukastw97@gmail.com>