fix: client prompt return on context cancellation

[umegbewe]

This fixes the issue where the client blocks for the entire duration of the response stream, even when the provided context had already been canceled or times out

Relevant issue #1698

[bwplotka]

Thanks! Some questions, not sure if this will work. My understanding was that we have to manually chunk reads from the resp.Body.

[kakkoyun]

@umegbewe The PR need to rebase.
I have also pinged @bwplotka to have another look at it.

[umegbewe]

@bwplotka @kakkoyun updated, PR is good to go