Move BankCommitmentCache to solana_runtime (#10816)

* Remove Blockstore member variable from BlockCommitmentCache

* Hoist is_confirmed_rooted() to its only caller

BlockCommitmentCache no longer depends on Blockstore

* Move BlockCommitmentCache to solana_runtime

runtime/src/lib.rs

@@ -8,6 +8,7 @@ pub mod bank_forks;
 mod blockhash_queue;
 pub mod bloom;
 pub mod builtin_programs;
+pub mod commitment;
 pub mod epoch_stakes;
 pub mod genesis_utils;
 pub mod hardened_unpack;