Make sound to_name a const fn (#519)

Small change but should make it a bit faster

pumpkin-data/build/sound.rs

@@ -50,7 +50,7 @@ pub(crate) fn build() -> TokenStream {
                 }
             }
 
-            pub fn to_name(&self) -> &'static str {
+            pub const fn to_name(&self) -> &'static str {
                 match self {
                     #type_to_name
                 }