Changes to Create a secret for an agent.

added the optional property warning to the response with the 201 status

added the required property secret/created_by to the response with the 201 status

added the required property secret/last_modified_by to the response with the 201 status

added the non-success response with the status 415

added the non-success response with the status 422

the response property details became nullable for the status 400

the response property details became nullable for the status 404

the response property details became nullable for the status 500

the request property oauth/allOf[subschema #2]/credentials/registration/additionalProperties became nullable

the request property oauth/allOf[subschema #2]/credentials/revocation/additionalProperties became nullable

added the new optional query request parameter update_sandbox

added the new required request property hosts

added the new required request property key

added the new required request property type

removed the required property stored from the response with the 201 status

removed the request property secrets

added the new optional request property oauth

added the new optional request property value

added the required property secret to the response with the 201 status

endpoint added