Add custom_attributes field to OrganizationMembership (#318)

* Add idpAttributes field to OrganizationMembership

- Add @Property array<string, mixed> $idpAttributes to PHPDoc
- Add "idpAttributes" to RESOURCE_ATTRIBUTES array
- Add "idp_attributes" => "idpAttributes" to RESPONSE_TO_RESOURCE_KEY mapping
- Update test fixtures to include idp_attributes field
- All 13 tests pass

This change adds support for IDP custom attributes on organization
memberships, which are sourced from the identity provider and stored
as customAttributes in the API.

Related to workos/workos PR #50470

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* Rename idp_attributes to custom_attributes

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: ajworkos

lib/Resource/OrganizationMembership.php

@@ -14,6 +14,7 @@
  * @property RoleResponse $role
  * @property array<RoleResponse> $roles
  * @property 'active'|'inactive'|'pending' $status
+ * @property array<string, mixed> $customAttributes
  * @property string $createdAt
  * @property string $updatedAt
  */
@@ -29,6 +30,7 @@ class OrganizationMembership extends BaseWorkOSResource
         "role",
         "roles",
         "status",
+        "customAttributes",
         "createdAt",
         "updatedAt"
     ];
@@ -41,6 +43,7 @@ class OrganizationMembership extends BaseWorkOSResource
         "role" => "role",
         "roles" => "roles",
         "status" => "status",
+        "custom_attributes" => "customAttributes",
         "created_at" => "createdAt",
         "updated_at" => "updatedAt"
     ];

tests/WorkOS/UserManagementTest.php

@@ -1750,6 +1750,7 @@ private function organizationMembershipResponseFixture($status = "active")
                 ],
             ],
             "status" => $status,
+            "custom_attributes" => [],
             "created_at" => "2021-06-25T19:07:33.155Z",
             "updated_at" => "2021-06-25T19:07:33.155Z",
         ]);
@@ -1774,6 +1775,7 @@ private function organizationMembershipListResponseFixture()
                             ]
                         ],
                         "status" => "active",
+                        "custom_attributes" => [],
                         "created_at" => "2021-06-25T19:07:33.155Z",
                         "updated_at" => "2021-06-25T19:07:33.155Z",
                     ]
@@ -1798,6 +1800,7 @@ private function organizationMembershipFixture()
                 new RoleResponse("admin"),
             ],
             "status" => "active",
+            "customAttributes" => [],
             "createdAt" => "2021-06-25T19:07:33.155Z",
             "updatedAt" => "2021-06-25T19:07:33.155Z",
         ];