perf: Speedup coins.AmountOf() by removing many regex calls (backport c…

…osmos#10021) (cosmos#10166)

* perf: Speedup coins.AmountOf() by removing many regex calls (cosmos#10021)

(cherry picked from commit ed35bfd)

# Conflicts:
#	CHANGELOG.md

* fix conflict

* fix changelog

Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>
Co-authored-by: Robert Zaremba <robert@zaremba.ch>

CHANGELOG.md

@@ -37,6 +37,9 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+### Improvements
+* (types) [\#10021](https://github.com/cosmos/cosmos-sdk/pull/10021) Speedup coins.AmountOf(), by removing many intermittent regex calls.
+
 ### Bug Fixes
 
 * (x/genutil) [#10104](https://github.com/cosmos/cosmos-sdk/pull/10104) Ensure the `init` command reads the `--home` flag value correctly.