feat: add optional hotpath profiling support (#2380)

* feat: add hotpath profiling support
* perf(hotpath): make hotpath an optional dependency

easytier/src/easytier-core.rs

@@ -1,5 +1,11 @@
 use easytier::core;
 
+#[cfg(all(
+    feature = "hotpath-alloc",
+    any(feature = "jemalloc", feature = "mimalloc")
+))]
+compile_error!("feature `hotpath-alloc` cannot be enabled together with `jemalloc` or `mimalloc`");
+
 #[cfg(all(feature = "mimalloc", not(feature = "jemalloc")))]
 use mimalloc::MiMalloc;
 
@@ -24,6 +30,16 @@ pub static malloc_conf: &[u8] = b"retain:false\0";
 rust_i18n::i18n!("locales", fallback = "en");
 
 #[tokio::main(flavor = "current_thread")]
+#[cfg_attr(
+    all(
+        feature = "hotpath",
+        not(all(
+            feature = "hotpath-alloc",
+            any(feature = "jemalloc", feature = "mimalloc")
+        ))
+    ),
+    hotpath::main
+)]
 async fn main() -> std::process::ExitCode {
     core::main().await
 }