feat: add cli support to build assets from executable (#3429)

* feat: add cli support to build assets from executable

See https://github.com/DioxusLabs/dioxus/discussions/3402#discussioncomment-11632372

* fix: store relative paths in executable

* bring back deprecation warning

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/cli/src/main.rs

@@ -57,6 +57,7 @@ async fn main() {
         Commands::Serve(opts) => opts.serve().await,
         Commands::Bundle(opts) => opts.bundle().await,
         Commands::Run(opts) => opts.run().await,
+        Commands::BuildAssets(opts) => opts.run().await,
     };
 
     // Provide a structured output for third party tools that can consume the output of the CLI