feat(fileinfo): use AHashMap for metadata fields

- Add ahash dependency to workspace, filemeta, and utils crates
- Change FileInfo.metadata to AHashMap<String, String>
- Change ObjectPartInfo.checksums to Option<AHashMap<String, String>>
- Change MetaObjectV1.meta to AHashMap<String, String>
- Change MetaObjectV1Part.checksums to Option<AHashMap<String, String>>
- Change UniquePartChecksums to use AHashMap
- Make metadata_compat functions generic over BuildHasher
- Make get_internal_replication_state generic over BuildHasher

This optimization replaces the standard library's SipHash with ahash,
which provides 2-3x faster hashing for typical key types.

Refs: https://github.com/rustfs/backlog/issues/2005

Co-Authored-By: heihutu <heihutu@gmail.com>

crates/filemeta/Cargo.toml

@@ -51,6 +51,9 @@ s3s = { workspace = true, features = ["minio"] }
 regex.workspace = true
 arc-swap.workspace = true
 
+# High-performance hashing
+ahash = { workspace = true, features = ["serde"] }
+
 [dev-dependencies]
 criterion = { workspace = true, features = ["html_reports"] }
 tempfile = { workspace = true }