Fix more examples to work with dioxus-native (#5179)

* Enable native for hotdog, file-explorer, and bluetooth-scanner examples

Signed-off-by: Nico Burns <nico@nicoburns.com>

* Fix crash in calculator example

Signed-off-by: Nico Burns <nico@nicoburns.com>

* Add config macro for native

* Add Config struct to dioxus-native

* Re-export dioxus-native as dioxus::native

* Fix calculator example to work with dioxus-native

* Fix calculator_mutable example to work with dioxus-native

---------

Signed-off-by: Nico Burns <nico@nicoburns.com>

examples/01-app-demos/file-explorer/Cargo.toml

@@ -7,5 +7,10 @@ publish = false
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-dioxus = { workspace = true, features = ["desktop"] }
+dioxus = { workspace = true }
 open = { workspace = true }
+
+[features]
+default = ["desktop"]
+desktop = ["dioxus/desktop"]
+native = ["dioxus/native"]