feat: Support incremental mode:

- Support incremental mode in heromodels
- Updated the example to refelct the changes
- Updated the tests to reflect the changes

heromodels-derive/src/lib.rs

@@ -130,7 +130,7 @@ pub fn model(_attr: TokenStream, item: TokenStream) -> TokenStream {
             }
 
             fn get_id(&self) -> u32 {
-                self.base_data.id
+                self.base_data.id.unwrap_or(0)
             }
 
             fn base_data_mut(&mut self) -> &mut heromodels_core::BaseModelData {