Fix revive package stuttering errors

- Rename SecretMetadata to Metadata in secret package
- Rename SecretVersion to Version in secret package
- Update NewSecretVersion to NewVersion function
- Update all references across the codebase including:
  - vault package aliases
  - CLI usage
  - test files
  - method receivers and signatures

internal/cli/version.go

@@ -114,7 +114,7 @@ func (cli *Instance) ListVersions(cmd *cobra.Command, secretName string) error {
 
 	// Load and display each version's metadata
 	for _, version := range versions {
-		sv := secret.NewSecretVersion(vlt, secretName, version)
+		sv := secret.NewVersion(vlt, secretName, version)
 
 		// Load metadata
 		if err := sv.LoadMetadata(ltIdentity); err != nil {