perf(ecstore): batch local EC shard preads on GET (#5679)

Collapse per-shard blocking-pool round-trips into one spawn_blocking
pread batch when all online shards are local and mmap-read is enabled.

Co-authored-by: ba <ba@ubuntu-server.alpha30.bos16>
Co-authored-by: Zhengchao An <anzhengchao@gmail.com>

crates/ecstore/src/disk/disk_store.rs

@@ -1088,6 +1088,10 @@ impl LocalDiskWrapper {
         self.disk.clone()
     }
 
+    pub fn get_object_path_if_local(&self, volume: &str, path: &str) -> crate::disk::error::Result<std::path::PathBuf> {
+        self.disk.get_object_path(volume, path)
+    }
+
     pub fn runtime_state(&self) -> RuntimeDriveHealthState {
         self.health.runtime_state()
     }