OpenAI Statefull /v1/responses & /v1/chat/completion

[JGoutin]

Implement if compatible with Bedrock sessions:

• POST /v1/responses (with store=true)

• GET /v1/responses/{response_id}

• DELETE /v1/responses/{response_id}

• GET /v1/responses/{response_id}/input_items

• POST /v1/responses/{response_id}/cancel

• POST /v1/conversations

• GET /v1/conversations/{conversation_id}

• POST /v1/conversations/{conversation_id}

• DELETE /v1/conversations/{conversation_id}

• POST /v1/conversations/{conversation_id}/items

• GET /v1/conversations/{conversation_id}/items/{item_id}

• DELETE /v1/conversations/{conversation_id}/items/{item_id}

• GET /v1/conversations/{conversation_id}/items

• POST /v1/chat/completions (with store=true)

• GET /V1/chat/completions/{completion_id}

• POST /v1/chat/completions/{completion_id}

• DELETE /v1/chat/completions/{completion_id}

• GET /v1/chat/completions

• GET /V1/chat/completions/{completion_id}/messages

REF:

• https://developers.openai.com/api/reference/resources/chat/subresources/completions/methods/create
• https://developers.openai.com/api/reference/resources/responses/methods/create
• https://docs.aws.amazon.com/bedrock/latest/userguide/sessions.html