Move status cache serialization to the Snapshot Packager service (#6081)

* Move status cache serialization to the Snapshot Packager service

* Minor comment updates

* use ok_or_else instead of ok_or

* satus cache

* Remove assert when snapshot format is wrong

* Fix compile

* Remove slots_to_snapshot from bank forks

* Address review comment

* Remove unused imports

runtime/src/status_cache.rs

@@ -1,13 +1,13 @@
 use log::*;
 use rand::{thread_rng, Rng};
 use serde::Serialize;
-use solana_sdk::clock::{Slot, MAX_HASH_AGE_IN_SECONDS};
+use solana_sdk::clock::{Slot, MAX_RECENT_BLOCKHASHES};
 use solana_sdk::hash::Hash;
 use solana_sdk::signature::Signature;
 use std::collections::{HashMap, HashSet};
 use std::sync::{Arc, Mutex};
 
-pub const MAX_CACHE_ENTRIES: usize = MAX_HASH_AGE_IN_SECONDS;
+pub const MAX_CACHE_ENTRIES: usize = MAX_RECENT_BLOCKHASHES;
 const CACHED_SIGNATURE_SIZE: usize = 20;
 
 // Store forks in a single chunk of memory to avoid another lookup.
@@ -430,4 +430,9 @@ mod tests {
         assert_eq!(cache, status_cache);
     }
 
+    #[test]
+    fn test_age_sanity() {
+        assert!(MAX_CACHE_ENTRIES <= MAX_RECENT_BLOCKHASHES);
+    }
+
 }