feat(handlers/credentiallibraries): Support Vault LDAP credential library

internal/proto/controller/api/resources/credentiallibraries/v1/credential_library.proto

@@ -77,6 +77,11 @@ message CredentialLibrary {
       (custom_options.v1.generate_sdk_option) = true,
       (custom_options.v1.subtype) = "vault-generic"
     ];
+    VaultLdapCredentialLibraryAttributes vault_ldap_credential_library_attributes = 104 [
+      (google.api.field_visibility).restriction = "INTERNAL",
+      (custom_options.v1.generate_sdk_option) = true,
+      (custom_options.v1.subtype) = "vault-ldap"
+    ];
   }
 
   // Output only. The available actions on this resource for this user.
@@ -210,3 +215,15 @@ message VaultSSHCertificateCredentialLibraryAttributes {
     }
   ]; // @gotags: `class:"public"`
 }
+
+// The attributes of a vault LDAP Credential Library.
+message VaultLdapCredentialLibraryAttributes {
+  // The path in Vault to request credentials from.
+  google.protobuf.StringValue path = 10 [
+    (custom_options.v1.generate_sdk_option) = true,
+    (custom_options.v1.mask_mapping) = {
+      this: "attributes.path"
+      that: "VaultPath"
+    }
+  ]; // @gotags: `class:"public"`
+}