Application.run() should be noasync

[weissi]

vapor/Sources/Vapor/Application.swift

Line 102 in b293ee5

public func run() throws {

Application.run() blocks the calling thread. That's fine but not on the Swift Concurrency thread pools. It should therefore be marked @available(*, noasync).

Additionally, it might be worthwhile to provide an public func run() async which awaits the shutdown.

[Joannis]

I believe I have the second idea already in a PR, I might've forgotten to submit it though. I forgot about noasync, let me do that!

[Joannis]

I want to add that it's become a notorious issue in func main() async throws