[Swift language features] Surfacing default protocol constraints on types

[jkurdek]

In Swift types can have default conformances which are hidden in the source code. For example a @frozen struct might conform to Copyable, Escapable, Sendable, BitwiseCopyable. We should decide whether we need to surface those constraints and in case we do, how to surface those constraints. Should they be applied to every generated struct? Maybe we need a common base?