weak_delegate: @NSApplicationDelegateAdaptor should be excepted

[tillhainbach]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

New rule request

This is a complement to #3456:

The weak delegate rule fires on the following declaration, which is not appropriate:

@NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

I will create a PR follow up PR, complementing the exception for these SwiftUI specified wrappers.

[circAssimilate]

I noticed that #3599 is approved but not merged. In case it wasn't clear to anyone the kinda difficult to arrive at workaround is this.

struct TimeTravelApp: App {
  // swiftlint:disable:next weak_delegate
  @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate