Add input/output/cached token info and timestamp info to saved chat history

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Codex CLI automatically records and saves chat history to rollout-<timestamp>-<uuid>.jsonl files in ~/.codex/sessions. It includes a record of user and AI rich messages, tool calls with input and output, and message IDs and statuses, and even error messages. The only information that's missing seems to just be input/output/cached token information, message timestamps, and the model used for the chat!

I'm working on a tool called Splitrail, a usage analyzer for agentic development tools. I'm currently implementing Codex support, and the tool needs this token information.

I've got a fix locally that I'm almost ready to make a PR for.

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I submitted a PR: #1583.