Validate Okta API ownership

[!note] Management API endpoints are not meant to be used in real-time integrations that directly serve your end users. Rate limit: 3 requests per second.

Validate the ownership of the API through a challenge-response mechanism.

This challenger endpoint is used by Okta to confirm that communication between Talon.One and Okta is correctly configured and accessible for provisioning and deprovisioning of Talon.One users, and that only Talon.One can receive and respond to events from Okta.