Add default storage class to ListObjectsV2 (#765)

* Add InvalidRangeSpec error

* Add EntityTooSmall to from_u32

* Add InvalidRangeSpec to from_u32

* Map InvalidRangeSpec to correct S3ErrorCode

* Return Error::InvalidRangeSpec

* Use auto implementation

* Add default storage class to ListObjectsV2

Resolves #764

* Add storage_class to response

* Make storage class optional so default won't be an empty string

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Co-authored-by: houseme <housemecn@gmail.com>

rustfs/src/storage/ecfs.rs

@@ -2218,6 +2218,7 @@ impl S3 for FS {
                     last_modified: v.mod_time.map(Timestamp::from),
                     size: Some(v.get_actual_size().unwrap_or_default()),
                     e_tag: v.etag.clone().map(|etag| to_s3s_etag(&etag)),
+                    storage_class: v.storage_class.clone().map(ObjectStorageClass::from),
                     ..Default::default()
                 };