Introduce eager rent collection (#9527)

* Switch AccountsIndex.account_maps from HashMap to BTreeMap

* Introduce eager rent collection

* Start to add tests

* Avoid too short eager rent collection cycles

* Add more tests

* Add more tests...

* Refacotr!!!!!!

* Refactoring follow up

* More tiny cleanups

* Don't rewrite 0-lamport accounts to be deterministic

* Refactor a bit

* Do hard fork, restore tests, and perf. mitigation

* Fix build...

* Refactor and add switch over for testnet (TdS)

* Use to_be_bytes

* cleanup

* More tiny cleanup

* Rebase cleanup

* Set Bank::genesis_hash when resuming from snapshot

* Reorder fns and clean ups

* Better naming and commenting

* Yet more naming clarifications

* Make prefix width strictly uniform for 2-base partition_count

* Fix typo...

* Revert cluster-dependent gate

* kick ci?

* kick ci?

* kick ci?

core/tests/bank_forks.rs

@@ -20,6 +20,7 @@ mod tests {
     };
     use solana_sdk::{
         clock::Slot,
+        genesis_config::GenesisConfig,
         hash::hashv,
         pubkey::Pubkey,
         signature::{Keypair, Signer},
@@ -95,6 +96,7 @@ mod tests {
                 &CompressionType::Bzip2,
             ),
             CompressionType::Bzip2,
+            &GenesisConfig::default(),
         )
         .unwrap();