[grpc-io] [grpc-go] ClientConn exposes WaitForConnection API

[yishu]

Hey grpc community,
I am sorry if it's been asked. I did a very short research and didn't find
the answer.

Is it possible for ClientConn
<https://sourcegraph.com/github.com/grpc/grpc-go/-/blob/clientconn.go?L613> to
expose a WaitForConnection API that blocks until connectivity becomes
READY? something like
```
func (cc *ClientConn) WaitForConnection(cc *grpc.ClientConn, deadline
time.Time) {
    ctx := context.Background()
    if deadline != time.Time{} {
        var cancel context.CancelFunc
        ctx, cancel = context.WithDeadline(ctx, deadline)
        defer cancel()
    }
    for {
        state := cc.GetState()
        if state == connectivity.Ready {
            return
        }
        if !cc.WaitForStateChange(ctx, state) {
            return
        }
    }
}
```
yishu

-- 
戴翊書
Yi-Shu Tai
Software Engineer @Dropbox

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