Changes to Create an Anthropic message

request body became required

the messages request property's minItems was increased to 1

api operation id anthropicGateway_api_anthropic_v1_messages_create removed and replaced with api_anthropic_v1_messages_create

api tag Anthropic Gateway added

api tag anthropicGateway removed

added the media type text/event-stream for the response with the status 200

the header request parameter anthropic-version became optional

added the non-success response with the status 403

removed the non-success response with the status 401

api operation id api-anthropic-v-1-messages-create removed and replaced with anthropicGateway_api_anthropic_v1_messages_create