refactor(config): generate scalar validation boundaries

libs/kaptan-config-derive/tests/pass/aggregate_sections.rs

@@ -0,0 +1,27 @@
+use kaptan_config::{ConfigAggregate, ConfigSection, ConfigViolation, ValidateFields};
+use kaptan_config_derive::ConfigValidate;
+
+#[derive(ConfigValidate)]
+struct Child {
+    #[config(id = 1, key = "child.value", unit = "count", default = 1, range(min = 0, max = 2))]
+    value: u32,
+}
+
+#[derive(ConfigValidate)]
+#[config(post = Self::validate_complete)]
+struct Root {
+    #[config(section)]
+    child: Child,
+}
+
+impl Root {
+    fn validate_complete(&self) -> Result<(), ConfigViolation> {
+        self.child.validate_fields()
+    }
+}
+
+fn main() {
+    let root = Root::default_aggregate().unwrap();
+    assert_eq!(Root::FIELD_COUNT, 1);
+    assert_eq!(root.child.field_value(kaptan_config::FieldId::new(1)), Some(kaptan_config::ConfigValue::U32(1)));
+}