feat: Migrate SAL to Cargo workspace

- Migrate individual modules to independent crates
- Refactor dependencies for improved modularity
- Update build system and testing infrastructure
- Update documentation to reflect new structure

vault/src/symmetric/mod.rs

@@ -6,10 +6,8 @@ pub mod implementation;
 
 // Re-export public types and functions
 pub use implementation::{
-    generate_symmetric_key, derive_key_from_password,
-    encrypt_symmetric, decrypt_symmetric,
-    encrypt_with_key, decrypt_with_key,
-    encrypt_key_space, decrypt_key_space,
-    serialize_encrypted_space, deserialize_encrypted_space,
-    EncryptedKeySpace, EncryptedKeySpaceMetadata
+    decrypt_key_space, decrypt_symmetric, decrypt_with_key, derive_key_from_password,
+    deserialize_encrypted_space, encrypt_key_space, encrypt_symmetric, encrypt_with_key,
+    generate_symmetric_key, serialize_encrypted_space, EncryptedKeySpace,
+    EncryptedKeySpaceMetadata,
 };