Add Support for Array of Strings in Custom Attributes in Types

[Khalil-codes]

Related Issues

Fixes #443

PR Description: Add Support for Array of Strings in Custom Attributes

Overview

This PR updates the Node SDK to support arrays of strings for custom attributes when creating or updating tenants and users. Previously, the SDK did not allow arrays, despite the Descope UI supporting multi-select attributes, which function as an array of strings.

Changes Introduced

• Updated the custom attribute type definition to include string[] in the union.
• Ensured that multi-select attributes can be assigned as an array of strings when using the SDK.
• Added validation to handle array-based attributes correctly.
• Updated relevant documentation and type definitions.

Fixes

• Resolves the issue where multi-select attributes could not be set via the SDK.

Testing

• Successfully created and updated tenants and users with multi-select attributes using an array of strings.
• Verified that existing functionality remains unaffected.
• Added unit tests to ensure proper handling of array attributes.

Next Steps

• Review if additional SDKs require a similar update for consistency.
• Update documentation if needed to reflect this change.