[router] Add rustfmt and set group imports by default (#11732)

sgl-router/benches/tool_parser_benchmark.rs

@@ -7,15 +7,22 @@
 //! - Streaming vs complete parsing
 //! - Different model formats (JSON, Mistral, Qwen, Pythonic, etc.)
 
+use std::{
+    collections::BTreeMap,
+    sync::{
+        atomic::{AtomicBool, AtomicU64, Ordering},
+        Arc, Mutex,
+    },
+    thread,
+    time::{Duration, Instant},
+};
+
 use criterion::{black_box, criterion_group, BenchmarkId, Criterion, Throughput};
 use serde_json::json;
-use sglang_router_rs::protocols::common::{Function, Tool};
-use sglang_router_rs::tool_parser::{JsonParser, ParserFactory as ToolParserFactory, ToolParser};
-use std::collections::BTreeMap;
-use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
-use std::sync::{Arc, Mutex};
-use std::thread;
-use std::time::{Duration, Instant};
+use sglang_router_rs::{
+    protocols::common::{Function, Tool},
+    tool_parser::{JsonParser, ParserFactory as ToolParserFactory, ToolParser},
+};
 use tokio::runtime::Runtime;
 
 // Test data for different parser formats - realistic complex examples