feat: allowing for creating a SpawnOnStartup hook without boxing it

src/extensions/hooks/startup.rs

@@ -14,12 +14,17 @@ pub struct SpawnOnStartup {
 }
 
 impl SpawnOnStartup {
+    /// Create a new unboxed startup hook ready for adding to your Config
+    pub fn new(prog: impl Into<Cow<'static, str>>) -> Self {
+        Self { prog: prog.into() }
+    }
+
     /// Create a new startup hook ready for adding to your Config
     pub fn boxed<X>(prog: impl Into<Cow<'static, str>>) -> Box<dyn StateHook<X>>
     where
         X: XConn,
     {
-        Box::new(Self { prog: prog.into() })
+        Box::new(Self::new(prog))
     }
 }