feat(events): add hashed customer_email and feature_metadata (#5220)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/common_utils/src/lib.rs

@@ -31,6 +31,8 @@ pub mod static_cache;
 pub mod types;
 pub mod validation;
 
+/// Used for hashing
+pub mod hashing;
 #[cfg(feature = "metrics")]
 pub mod metrics;