Would like access to the vmservice instance before connecting to an application

I believe the vmservice object is shared across all applications, right? In that case, it would make setup in the flutter runner a lot simpler if I didn't need to wait until I had a connected app to get access to it.

One particular place where this is causing difficulty is that I need to be very careful when I listen to the stdout and stderr streams, otherwise I might miss events on startup.

Start by tracing the Flutter runner's setup and the point where the shared vmservice object becomes available; inspect how stdout and stderr listeners are attached during startup. Done means callers can access vmservice before an application connects without missing startup stream events.

Written by the indexing model from the issue text.