feat(config): add validated profile core

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

@@ -0,0 +1,11 @@
+use kaptan_config_derive::ConfigValidate;
+
+#[derive(ConfigValidate)]
+struct RootBooleanConfig {
+    #[config(id = 1, key = "enabled", unit = "bool", default = true)]
+    enabled: bool,
+}
+
+fn main() {
+    assert_eq!(RootBooleanConfig::DESCRIPTORS.len(), 1);
+}