[Feature Request] - Connect and Sign in one go

[GrimLothar]

I'm looking for a way to Connect and Sign to wallet on mobile (iOS/Android/Saga) with a single transaction. Currently you first have to connect (takes you from your app to the wallet, and then back) and THEN sign a message (again takes you from your app to the wallet and back). This is a very bad experience for the end user.

Ideally Sign In With Solana would also work, but it should still work with the old way of connect + sign for wallets that don't support SIWS

Thanks!