feat: move all json and validate to new utils

crates/delta/src/util/json/mod.rs

@@ -0,0 +1,27 @@
+pub mod json;
+pub mod validator;
+
+pub use json::Json;
+pub use validator::Validate;
+
+#[macro_export]
+macro_rules! fn_request_body {
+    ($gen:ident, $ty:path, $mime_type:expr) => {{
+        let schema = $gen.json_schema::<$ty>();
+        Ok(revolt_rocket_okapi::revolt_okapi::openapi3::RequestBody {
+            content: {
+                let mut map = revolt_rocket_okapi::revolt_okapi::Map::new();
+                map.insert(
+                    $mime_type.to_owned(),
+                    revolt_rocket_okapi::revolt_okapi::openapi3::MediaType {
+                        schema: Some(schema),
+                        ..Default::default()
+                    },
+                );
+                map
+            },
+            required: true,
+            ..Default::default()
+        })
+    }};
+}