Move blocktree_processor to solana_ledger (#6460)

* Drop core::result dependency in bank_forks

* Move blocktree_processor into solana_ledger

ledger/src/lib.rs

@@ -1,5 +1,7 @@
+pub mod bank_forks;
 #[macro_use]
 pub mod blocktree;
+pub mod blocktree_processor;
 pub mod entry;
 pub mod erasure;
 pub mod genesis_utils;
@@ -8,5 +10,11 @@ pub mod leader_schedule_cache;
 pub mod leader_schedule_utils;
 pub mod perf_libs;
 pub mod poh;
+pub mod rooted_slot_iterator;
 pub mod shred;
+pub mod snapshot_package;
+pub mod snapshot_utils;
 pub mod staking_utils;
+
+#[macro_use]
+extern crate solana_metrics;