Feature walks: generate them from field roles with #[derive(Walk)] (#1251)

The three walks over a feature (expressions, references, geometry) are generated from FeatureKind by #[derive(Walk)] in a new proc-macro crate, solidcraft-derive, from #[walk(...)] attributes written next to each field. The hand-written walks in params.rs, feature_refs.rs and feature_geometry.rs are gone; Ruled Surface and Extend have their attributes, and the three golden walk records are unchanged.

Co-authored-by: jijinbei <[email protected]>

Cargo.lock

@@ -3479,6 +3479,15 @@ dependencies = [
  "solidcraft-mcp",
 ]
 
+[[package]]
+name = "solidcraft-derive"
+version = "0.11.0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
 [[package]]
 name = "solidcraft-doc"
 version = "0.11.0"
@@ -3487,6 +3496,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sha2",
+ "solidcraft-derive",
  "solidcraft-geom",
  "solidcraft-kernel",
  "solidcraft-render",