[chore][GraphQL/Limits] Standardise query_limits_checker file order

## Description

This is a file order change only, with no other meaningful changes. It
standardises the order to:

- Constants
- Types
- Impls
- Trait Impls
- Free functions

## Test plan

CI

crates/sui-graphql-rpc/src/extensions/query_limits_checker.rs

@@ -23,9 +23,16 @@ use tokio::sync::Mutex;
 use tracing::info;
 use uuid::Uuid;
 
+pub(crate) const CONNECTION_FIELDS: [&str; 2] = ["edges", "nodes"];
+
 /// Extension factory for adding checks that the query is within configurable limits.
 pub(crate) struct QueryLimitsChecker;
 
+#[derive(Debug, Default)]
+struct QueryLimitsCheckerExt {
+ validation_result: Mutex<Option<ValidationRes>>,
+}
+
 /// Only display usage information if this header was in the request.
 pub(crate) struct ShowUsage;
 
@@ -39,13 +46,13 @@ struct ValidationRes {
  query_payload: u32,
 }
 
-#[derive(Debug, Default)]
-struct QueryLimitsCheckerExt {
- validation_result: Mutex<Option<ValidationRes>>,
+#[derive(Debug)]
+struct ComponentCost {
+ pub input_nodes: u32,
+ pub output_nodes: u32,
+ pub depth: u32,
 }
 
-pub(crate) const CONNECTION_FIELDS: [&str; 2] = ["edges", "nodes"];
-
 impl ShowUsage {
  pub(crate) fn name() -> &'static HeaderName {
  &LIMITS_HEADER
@@ -60,25 +67,6 @@ impl ExtensionFactory for QueryLimitsChecker {
  }
 }
 
-#[derive(Debug)]
-struct ComponentCost {
- pub input_nodes: u32,
- pub output_nodes: u32,
- pub depth: u32,
-}
-
-impl std::ops::Add for ComponentCost {
- type Output = Self;
-
- fn add(self, rhs: Self) -> Self::Output {
- Self {
- input_nodes: self.input_nodes + rhs.input_nodes,
- output_nodes: self.output_nodes + rhs.output_nodes,
- depth: self.depth + rhs.depth,
- }
- }
-}
-
 #[async_trait::async_trait]
 impl Extension for QueryLimitsCheckerExt {
  async fn request(&self, ctx: &ExtensionContext<'_>, next: NextRequest<'_>) -> Response {
@@ -210,6 +198,18 @@ impl Extension for QueryLimitsCheckerExt {
  }
 }
 
+impl std::ops::Add for ComponentCost {
+ type Output = Self;
+
+ fn add(self, rhs: Self) -> Self::Output {
+ Self {
+ input_nodes: self.input_nodes + rhs.input_nodes,
+ output_nodes: self.output_nodes + rhs.output_nodes,
+ depth: self.depth + rhs.depth,
+ }
+ }
+}
+
 /// Parse the selected fields in one operation and check if it conforms to configured limits.
 fn analyze_selection_set(
  limits: &Limits,