Extended packing and extracting library for value types (#5056)

Co-authored-by: ernestognw <[email protected]>

Author: Amxx

.changeset/heavy-baboons-give.md

@@ -2,4 +2,4 @@
 'openzeppelin-solidity': minor
 ---
 
-`Packing`: Added a new utility for packing and unpacking multiple values into a single bytes32. Includes initial support for packing two `uint128` in an `Uint128x2` type.
+`Packing`: Added a new utility for packing, extracting and replacing bytesXX values.