fix(import/zsh-histdb): missing or wrong fields

[Aloxaf]

This PR do two things:

1. Imports exit_status and session columns from zsh-histdb
2. Converts duration to nanoseconds for importing

Checks

• I am happy for maintainers to push small adjustments to this PR, to speed up the review cycle
• I have checked that there are no existing pull requests for the same thing

[ellie]

Just a couple of comments

Are there any other fields we are missing?

[Aloxaf]

Just a couple of comments

Thanks for your suggestions. I have updated my code.

Are there any other fields we are missing?

No more fields.
But I notice that duration should be measured in nanoseconds. Considering this is a minor bug, I also fixed it in this PR.

[ellie]

looks good! thank you

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