about DefaultToolCallingManager support toolcall chunk in stream mode

[Iristack]

It looks like DefaultToolCallingManager isn't handling tool call chunks properly right now.
It throws an:

IllegalArgumentException complaining that the toolName is null or empty.

Here is what I'm seeing:

0 = {AssistantMessage$ToolCall@6413} "ToolCall[id=call_c37e074f0d3846d091cdf85e, type=function, name=echo, arguments=]"
1 = {AssistantMessage$ToolCall@6443} "ToolCall[id=call_c37e074f0d3846d091cdf85e, type=function, name=, arguments={"text": "2"}]"

maybe we can support it?

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[apd-ogiles]

Is this related to #4790