Changes to POST /v1/oauth/token

added the new optional request property assertion

added the new optional request property claim_token

added the new optional request property refresh_token

added the new urn:ietf:params:oauth:grant-type:jwt-bearer enum value to the request property grant_type

added the new urn:workos:agent-auth:grant-type:claim enum value to the request property grant_type

added the optional property assertion_expires to the response with the 200 status

added the optional property identity_assertion to the response with the 200 status