* Added Organization Feature Flags functionality in Organizations by introducing the `listOrganizationFeatureFlags` method.

Added tests to validate organization feature flags.

Resolved a deprecated notice in the OrganizationsTest to ensure compatibility with newer PHP versions.

Implemented support for reading Vault items.

Expanded the test suite to encompass Vault-related functionalities.

* Added patch with pagination and other changes from @nicknisi

This brings it into alignment with the Node SDK

* Fix PHP 8.4 deprecation: Add explicit nullable type hints

Resolves #296

PHP 8.4 deprecates implicitly nullable parameters (e.g., `string $param = null`).
This change adds explicit nullable type hints (`?string $param = null`) across
the SDK to eliminate deprecation warnings while maintaining backward compatibility
with PHP 7.3+.

Changes:
- Added explicit nullable type hints to all nullable parameters in:
  - UserManagement, AuditLogs, Organizations, SSO, MFA, Portal, DirectorySync
  - Client, CurlRequestClient, WebhookResponse
  - Exception classes (GenericException, BaseRequestException)
- Updated RequestClientInterface to match implementation signature
- Added tests to verify null parameter handling and backward compatibility
- Fixed test expectations to match actual implementation behavior

All 167 tests pass. No breaking changes - only type hints added.

* Resolved conflicts due to missing changes upstream.

Take particular note of the changes to $roleSlugs. There was a mismatch between the phpdoc, tests, and api docs. This commit went with the array due to both the test and api doc specifying the array type. The php doc was updated to reflect the array change.

Update PHPDoc to include missing intent values (certificate_renewal,
domain_verification) and add runtime validation for $intent parameter
to provide better error messages before API calls. Includes test
coverage for all intent values and invalid intent handling.

Fixes #295

* Add roles to directory user and profile

* fix roles serialization on org membership