Changes to POST /v1/notification-channels/default

added the new optional request property data/timezone

added the new optional header request parameter Authorization

added the new optional header request parameter x-organization-id

added the new optional header request parameter x-project-id

added the non-success response with the status 400

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 500

api operation id createDefaultChannel removed and replaced with createDefaultNotificationChannel

api operation id createDefaultNotificationChannel removed and replaced with createDefaultChannel