build(proto): advance to the connection-status session frames

Picks up ConnectionStatus and Configure on the session stream. The SDK
does not use them yet: they need a server release that carries them, and
implementing against an unreleased contract would ship code no deployed
node answers. Taking the definitions now keeps the generated stubs in
step with the protocol repository, so the client change lands as client
code alone when the release is out.

Author: polaz