refactor(api_keys): use a KMS encrypted API key hashing key and remove key ID prefix from plaintext API keys (#639)

Co-authored-by: Arun Raj M <jarnura47@gmail.com>

crates/router/src/services.rs

@@ -2,6 +2,7 @@ pub mod api;
 pub mod authentication;
 #[cfg(feature = "basilisk")]
 pub mod encryption;
+pub mod kms;
 pub mod logger;
 
 use std::sync::{atomic, Arc};