Provide a detailed breakdown of the usage_info

[DonJayamanne]

The goal is to display something similar to this in VS Code when using the Copilot CLI
Need a breakdown of the token usage

[github-actions]

Thank you for opening this issue!

I've labeled this as an enhancement. This is a great feature request to provide more detailed token usage breakdown in the session.usage_info event.

Currently, the event includes:

• tokenLimit — Maximum tokens allowed
• currentTokens — Current token count
• messagesLength — Number of messages

The request to provide a more granular breakdown (similar to the VS Code UI shown) would help developers better understand and display token consumption to end users. This would be a protocol-level change that would benefit all SDK implementations.

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