Fix outdir not work when run dx bundle --platform web --outdir mydir (#3572)

* Make legacy asset dir optional
* properly implement outdir

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Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>
Co-authored-by:  Nathy-bajo <bajon7680@gmail.com>

packages/cli/Cargo.toml

@@ -119,6 +119,7 @@ tauri-bundler = { workspace = true }
 include_dir = "0.7.4"
 flate2 = "1.0.35"
 tar = "0.4.43"
+dircpy = "0.3.19"
 
 [build-dependencies]
 built = { version = "=0.7.4", features = ["git2"] }