add streaming support for anthropic tool use

According to the [docs](https://docs.anthropic.com/en/docs/tool-use) requests with tool use don't support streaming at the moment. But, when anthropic tool use functionality goes GA, we should add support for it.

![Image](https://github.com/MagnivOrg/prompt-layer-api/assets/20099503/d3da2359-9f63-417a-8c28-72bf067a6877)