Changes to Messages (Anthropic-compatible)

the response's body type changed from no type to object for status 200

added the non-success response with the status 400

added the non-success response with the status 402

added the non-success response with the status 404

added the non-success response with the status 429

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

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

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

added the required property content to the response with the 200 status

added the required property id to the response with the 200 status

added the required property model to the response with the 200 status

added the required property stop_reason to the response with the 200 status

added the required property usage to the response with the 200 status

endpoint added