Add support for streaming with Anthropic Tools

[Ashton-Sidhu]

When using the Anthropic Agent with streaming: true, you get the error: "Anthropic does not support streaming . If you remove the code block

LlamaIndexTS/packages/llamaindex/src/agent/anthropic.ts

Lines 37 to 40 in 45bcf51

	if (stream) {
	// Anthropic does support this, but looks like it's not supported in the LITS LLM
	throw new Error("Anthropic does not support streaming");
	}

streaming does work fine but if you use tools, it says tools are not supported via Anthropic.

Anthropic does support streaming with tools and it would be great to get it integrated https://docs.anthropic.com/en/api/messages-streaming#streaming-request-with-tool-use

[SandipGyawali]

@Ashton-Sidhu is this open to contribute ?

[Ashton-Sidhu]

@Ashton-Sidhu is this open to contribute ?

Absolutely! I don't have time at the moment to do it

[SandipGyawali]

@Ashton-Sidhu i can do it assign me ??

[gongzhaoman]

I think this feat is not simple, as the streaming response from Anthropic does not indicate whether a tool should be called at the first moment. This means that it is impossible to distinguish whether it is the final message output at the beginning of the streaming response or even during the streaming response process. Currently, I believe it seems that only after the streaming response is completely finished can we make a good judgment on whether to call a tool or if it is the final output, but this has already lost the meaning of streaming response.