Warp timestamp and extend max-allowable-drift for accommodate slow blocks (bp #15204) (#15221)

* Warp timestamp and extend max-allowable-drift for accommodate slow blocks (#15204)

* Remove timestamp_correction feature gating

* Remove timestamp_bounding feature gating

* Remove unused deprecated ledger code

* Remove unused deprecated unbounded-timestamp code

* Enable independent adjustment of fast/slow timestamp bounding

* Update timestamp bounds to 25% fast, 80% slow; warp timestamp

* Update bank hash test

* Add PR number to feature

Co-authored-by: Michael Vines <mvines@gmail.com>

Co-authored-by: Michael Vines <mvines@gmail.com>
(cherry picked from commit da6753b8c0)

# Conflicts:
#	ledger/src/blockstore.rs
#	runtime/src/bank.rs
#	sdk/src/feature_set.rs

* Fix conflicts

Co-authored-by: Tyera Eulberg <teulberg@gmail.com>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

docs/src/developing/clients/jsonrpc-api.md

@@ -388,11 +388,6 @@ intermittently adding a timestamp to a Vote for a particular block. A requested
 block's time is calculated from the stake-weighted mean of the Vote timestamps
 in a set of recent blocks recorded on the ledger.
 
-Nodes that are booting from snapshot or limiting ledger size (by purging old
-slots) will return null timestamps for blocks below their lowest root +
-`TIMESTAMP_SLOT_RANGE`. Users interested in having this historical data must
-query a node that is built from genesis and retains the entire ledger.
-
 #### Parameters:
 
 - `<u64>` - block, identified by Slot