perf: Speedup cachekv iterator on large deletions & IBC v2 upgrade lo…

…gic (backport cosmos#10741) (cosmos#10745)

* perf: Speedup cachekv iterator on large deletions & IBC v2 upgrade logic (cosmos#10741)

(cherry picked from commit 314e1d5)

* fix conflicts

Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>
Co-authored-by: marbar3778 <marbar3778@yahoo.com>

CHANGELOG.md

@@ -159,7 +159,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
-* (baseapp) [\#10631](https://github.com/cosmos/cosmos-sdk/pull/10631)  Emit ante events even for the failed txs.
+* (baseapp) [\#10631](https://github.com/cosmos/cosmos-sdk/pull/10631)  Emit ante events even for the failed txs. 
+* (store) [\#10741](https://github.com/cosmos/cosmos-sdk/pull/10741) Significantly speedup iterator creation after delete heavy workloads. Significantly improves IBC migration times.
 
 ### Features