fix warnings

Signed-off-by: Alex Chi <iskyzh@gmail.com>

mini-lsm/src/compact.rs

@@ -20,7 +20,7 @@ use crate::manifest::ManifestRecord;
 use crate::table::{SsTable, SsTableBuilder, SsTableIterator};
 
 #[derive(Debug, Serialize, Deserialize)]
-pub(crate) enum CompactionTask {
+pub enum CompactionTask {
     Leveled(LeveledCompactionTask),
     Tiered(TieredCompactionTask),
     Simple(SimpleLeveledCompactionTask),