feat(menu): add icon support for Submenu in Rust and JS/TS APIs (#13722)

* feat(menu): add icon and nativeIcon support for Submenu in tauri and @tauri-apps/api

* Merge branch 'dev' into dev

* Update muda

* feat(menu): add set_icon and set_native_icon methods to set submenu icons

* feat(menu): unify icon handling by introducing MenuIcon type

* chore: sync bundle.global.js

* Make setIcon actually work

* Regenerate `bundle.global.js`

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Co-authored-by: Tony <legendmastertony@gmail.com>