chore: Move rest of coloring.rs into secret-memory crate

Also removes the StoreSecret trait from cli.rs as it was
redundant.

secret-memory/src/lib.rs

@@ -1,4 +1,8 @@
+pub mod debug;
+pub mod file;
+
 mod public;
 pub use crate::public::Public;
 
-pub mod debug;
+mod secret;
+pub use crate::secret::Secret;