read only account cache for executable accounts - improve replay (#16150)

* read only account cache

* tests

* clippy

* cleanup

* new file, add tests

* remove copy/paste code from test

* remove dead code

* all loads use cache

* remove stale comments

* add metrics logging for read only cache size

* report read only cache hits and misses

* consistency

* formatting

* rename, add comment

* u64

* better interaction with existing cache

* lru list saved between cleans

runtime/src/lib.rs

@@ -25,6 +25,7 @@ pub mod loader_utils;
 pub mod log_collector;
 pub mod message_processor;
 mod native_loader;
+mod read_only_accounts_cache;
 pub mod rent_collector;
 pub mod secondary_index;
 pub mod serde_snapshot;