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/vault/metadata.go

@@ -16,7 +16,7 @@ import (
 type (
 	VaultMetadata    = secret.VaultMetadata
 	UnlockerMetadata = secret.UnlockerMetadata
-	SecretMetadata   = secret.SecretMetadata
+	SecretMetadata   = secret.Metadata
 	Configuration    = secret.Configuration
 )