crypto/tls: add ConnectionState.CurveID #67516
Description
Proposal Details
With #67061, the selected "CurveID" is the difference between a post-quantum connection and not. We should expose it in ConnectionState. I actually assumed we were already exposing this.
It's unfortunate to use the CurveID misnomer, but ConnectionState doesn't feel like the place to start introducing a new name, it will only cause confusion.
/cc @golang/security