debugger support for dx (#3814)

* add vscode debugger for apps

* todo: need to disconnect when rebuilding

* update debugger

* add uri handler to remote launch the debugger

* attach

* dont panic

* fixed it - hung processes are not errors

* wip: android debugger

* clean it up a bit

* revert ios stdout/stderr

* wire up pid from ios

* use target family instead of target_arch

* fix android

* bring back softkill

* typo

packages/cli/src/build/context.rs

@@ -65,6 +65,12 @@ pub enum BuilderUpdate {
     ProcessExited {
         status: ExitStatus,
     },
+
+    /// Waiting for the process failed. This might be because it's hung or being debugged.
+    /// This is not the same as the process exiting, so it should just be logged but not treated as an error.
+    ProcessWaitFailed {
+        err: std::io::Error,
+    },
 }
 
 impl BuildContext {