fix(config): update variable names and remove unused imports

Refactor variable names to follow snake_case convention and remove unused imports across multiple files to improve code readability and maintainability.

harmony-rs/harmony_macros/src/lib.rs

@@ -52,7 +52,7 @@ pub fn mac_address(input: TokenStream) -> TokenStream {
             let b5 = bytes[5];
 
             quote! {
-            MacAddress( [#b0, #b1, #b2, #b3, #b4, #b5] )
+            harmony_types::net::MacAddress( [#b0, #b1, #b2, #b3, #b4, #b5] )
             }
             .into()
         }