feat: add dx print command, drive hotpatching engine directly. (#4602)

* feat: add dx print command

* small tweak to how client_target is handled

* hotpatching engine wired up!

* small cleanups

* lighter diff

* little bit more light cleanups

* remove changes to manganis

* fix wrong dir error

* move session_cache fixing to prebuild step

packages/cli/src/serve/runner.rs

@@ -97,7 +97,7 @@ impl AppServer {
 
         // Resolve the simpler args
         let interactive = args.is_interactive_tty();
-        let force_sequential = args.force_sequential;
+        let force_sequential = args.platform_args.shared.targets.force_sequential_build();
         let cross_origin_policy = args.cross_origin_policy;
 
         // Find the launch args for the client and server