UI for Event passes

[ueman]

Docs:

• https://developer.apple.com/library/archive/documentation/UserExperience/Conceptual/PassKit_PG/Creating.html#//apple_ref/doc/uid/TP40012195-CH4-SW8
• https://developer.apple.com/design/human-interface-guidelines/wallet#Event-tickets

Reference images:

Concrete example

The event example PkPass from the Apple Docs should look like the following image:

[ueman]

Take a look at https://api.flutter.dev/flutter/painting/CircularNotchedRectangle-class.html and https://api.flutter.dev/flutter/painting/AutomaticNotchedShape-class.html to create the notch