In most cases, either a &Bank or an Arc<Bank> is more proper.
- &Bank is used if the function only needs a momentary reference
- Arc<Bank> is used if the function needs its' own copy
This PR leaves several instances of &Arc<Bank> around; these instances
are situations where a clone may only happen conditionally.
* Plumb priority_fee_cache into rpc
* Add PrioritizationFeeCache api
* Add getRecentPrioritizationFees rpc endpoint
* Use MAX_TX_ACCOUNT_LOCKS to limit input keys
* Remove unused cache apis
* Map fee data by slot, and make rpc account inputs optional
* Add priority_fee_cache to rpc test framework, and add test
* Add endpoint to jsonrpc docs
* Update docs/src/developing/clients/jsonrpc-api.md
* Update docs/src/developing/clients/jsonrpc-api.md