Allow Type override in OpenAI.Responses.TextContent.

[TypeDefinition]

Assistant messages must now be type output_text instead of input_text

Adding this overload allows the user to do

new Message(OpenAI.Role.Assistant, new OpenAI.Responses.TextContent(message, ResponseContentType.OutputText));

in order to create an assistant message.

[StephenHodgson]

Output Text is only generated by the model.

Lets create a discussion first to understand how to best go about what it is you're trying to do, then propose changes :)

[StephenHodgson]

by the way, I've got the GA refactor for realtime planned:

• Migrate Realtime API to GA OpenAI-DotNet#496

I know that they changed a bunch of stuff, but it shouldn't break any existing things unless you add the GA header to the requests