Add usage for roledefinition (#35453)

Author: JoshLove-msft

specification/keyvault/Security.KeyVault.Administration/client.tsp

@@ -103,6 +103,8 @@ interface KeyVaultClient {
 @@clientName(KeyVault.Setting.value, "Content", "csharp");
 @@access(KeyVault, Access.internal, "csharp");
 
+@@usage(KeyVault.RoleDefinition, Usage.input | Usage.output, "csharp");
+
 // JavaScript customizations
 @@clientName(KeyVault.FullBackupOperation.azureStorageBlobContainerUri,
   "folderUri",