fix: avoid leveled compaction crash when recovering from manifest (#63)

* Fix: Avoid leveled copaction crash when recovering from manifest

* Also sort SSTs in manifest recovery

* Add `in_recovery` flag to `apply_compaction_result`

- Don't sort the SSTs inside `apply_compaction_result` if in recovery

mini-lsm-starter/src/compact/leveled.rs

@@ -50,6 +50,7 @@ impl LeveledCompactionController {
         _snapshot: &LsmStorageState,
         _task: &LeveledCompactionTask,
         _output: &[usize],
+        _in_recovery: bool,
     ) -> (LsmStorageState, Vec<usize>) {
         unimplemented!()
     }