Add support for stream_usage in AzureChatOpenAI

[KeiKawashima-HEROZ]

Checked

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Feature request

AzureChatOpenAI does not support stream_usage, which is in ChatOpenAI.

Azure's API version 2024-10-21 now supports include_usage.

See: https://learn.microsoft.com/en-us/azure/ai-services/openai/reference#chatcompletionstreamoptions

Therefore, AzureChatOpenAI will also support stream_usage.

Motivation

I want to use usage from the API response.

Proposal (If applicable)

No response