perf(ecstore): use AHashMap for FileInfo metadata fields (#6738)

crates/filemeta/src/lib.rs

@@ -22,6 +22,12 @@ mod replication;
 
 pub mod test_data;
 
+/// High-performance HashMap type alias using ahash instead of SipHash.
+pub type AHashMap<K, V> = ahash::AHashMap<K, V>;
+
+/// High-performance HashSet type alias using ahash.
+pub type AHashSet<K> = ahash::AHashSet<K>;
+
 pub use error::*;
 pub use fileinfo::*;
 pub use filemeta::*;