impl: auto-connect to toolbox backend (#24)

The auto connect happens only when:
- workspace is running
- the user clicks on one of the environments in the main page
- there isn't already an established connection

Author: fioan89

src/main/kotlin/com/coder/toolbox/CoderRemoteEnvironment.kt

@@ -110,31 +110,27 @@ class CoderRemoteEnvironment(
     override suspend
     fun getContentsView(): EnvironmentContentsView = EnvironmentView(client.url, workspace, agent)
 
+    override val connectionRequest: MutableStateFlow<Boolean>? = MutableStateFlow(false)
+
     /**
      * Does nothing.  In theory, we could do something like start the workspace
      * when you click into the workspace, but you would still need to press
      * "connect" anyway before the content is populated so there does not seem
      * to be much value.
      */
-    override fun setVisible(visibilityState: EnvironmentVisibilityState) {}
-
-    /**
-     * Immediately send the state to the listener and store for updates.
-     */
-//    override fun addStateListener(consumer: EnvironmentStateConsumer): Boolean {
-//        // TODO@JB: It would be ideal if we could have the workspace state and
-//        //          the connected state listed separately, since right now the
-//        //          connected state can mask the workspace state.
-//        // TODO@JB: You can still press connect if the environment is
-//        //          unreachable.  Is that expected?
-//        consumer.consume(status.toRemoteEnvironmentState(serviceLocator))
-//        return super.addStateListener(consumer)
-//    }
+    override fun setVisible(visibilityState: EnvironmentVisibilityState) {
+        if (wsRawStatus.ready() && visibilityState.contentsVisible == true && visibilityState.isBackendConnected == false) {
+            context.logger.info("Connecting to $id...")
+            context.cs.launch {
+                connectionRequest?.update {
+                    true
+                }
+            }
+        }
+    }
 
     override fun onDelete() {
         context.cs.launch {
-            // TODO info and cancel pop-ups only appear on the main page where all environments are listed.
-            //  However, #showSnackbar works on other pages. Until JetBrains fixes this issue we are going to use the snackbar
             val shouldDelete = if (wsRawStatus.canStop()) {
                 context.ui.showOkCancelPopup(
                     context.i18n.ptrl("Delete running workspace?"),