revert: remove #2351 chunk I/O and object-io crate (phase 7) (#2543)

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

crates/ecstore/src/store_api/types.rs

@@ -70,7 +70,6 @@ pub struct ObjectOptions {
 
     pub eval_metadata: Option<HashMap<String, String>>,
 
-    pub resolved_checksum: Option<Bytes>,
     pub want_checksum: Option<Checksum>,
     pub skip_verify_bitrot: bool,
     pub capacity_scope_token: Option<Uuid>,
@@ -511,18 +510,6 @@ impl ObjectInfo {
             })
             .collect();
 
-        let actual_size = fi
-            .parts
-            .iter()
-            .map(|part| {
-                if part.actual_size > 0 {
-                    part.actual_size
-                } else {
-                    i64::try_from(part.size).unwrap_or_default()
-                }
-            })
-            .sum();
-
         // TODO: part checksums
 
         ObjectInfo {
@@ -535,7 +522,6 @@ impl ObjectInfo {
             delete_marker: fi.deleted,
             mod_time: fi.mod_time,
             size: fi.size,
-            actual_size,
             parts,
             is_latest: fi.is_latest,
             user_tags,