[Pitch] Custom Metadata Attributes

Hello everyone! The following is a pitch for adding an ability to declared a runtime discoverable attributes in the Swift language. We welcome any feedback or questions about this pitch! Authors: Pavel Yaskevich, Holly Borla, Alejandro Alonso Status: Awaiting implementation Implementation: [Sema/SILGen/IRGen] Implement runtime discoverable attributes (under flag) by xedin · Pull Request #62426 · apple/swift · GitHub Introduction In Swift, declarations are annotated with attributes to op...