feat: Add web terminal with reconnecting TTYs (#1186)

* feat: Add web terminal with reconnecting TTYs

This adds a web terminal that can reconnect to resume sessions!
No more disconnects, and no more bad bufferring!

* Add xstate service

* Add the webpage for accessing a web terminal

* Add terminal page tests

* Use Ticker instead of Timer

* Active Windows mode on Windows

cli/agent.go

@@ -125,7 +125,9 @@ func workspaceAgent() *cobra.Command {
 				return xerrors.Errorf("writing agent url to config: %w", err)
 			}
 
-			closer := agent.New(client.ListenWorkspaceAgent, logger)
+			closer := agent.New(client.ListenWorkspaceAgent, &agent.Options{
+				Logger: logger,
+			})
 			<-cmd.Context().Done()
 			return closer.Close()
 		},