feat: Add support for responses api body

[OpeOginni]

Ideal fix for custom github copilot api using openai responses and preventing multiple use of Premium Request.

https://platform.openai.com/docs/api-reference/responses/create#responses-create-input

Solution proposed anomalyco/opencode#2758 (comment)

[wienans]

Is it wise to explicitly define the tool call names? Or are these specifically defined by the responses api and not by the client?

[OpeOginni]

Is it wise to explicitly define the tool call names? Or are these specifically defined by the responses api and not by the client?

These tools are defined by the api, and are somewhat built in. You could check the docs I linked.

[caozhiyuan]

@OpeOginni miss type = "reasoning" ?

[OpeOginni]

@OpeOginni miss type = "reasoning" ?

My bad I missed it, thank you

https://platform.openai.com/docs/api-reference/responses/create#responses-create-input-input-item-list-item-reasoning

[OpeOginni]

@rekram1-node sorry to tag, but no love for the PR? 😢

would make it easier to let people use my package for Codex 5 with Github, prevents multiple billed requests on just one prompt.