[WIP] Add missing DateTimeOffset functionality for Python target

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>Implement missing DateTimeOffset functionality for the Python target</issue_title>
<issue_description>Implement missing DateTimeOffset functionality for the Python target</issue_description>

<agent_instructions>Compare with full DateTimeOffset functionality in https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset?view=net-10.0</agent_instructions>

Comments on the Issue (you are @copilot in this section)

[dbrattli]

@ncave I disabled slash commands for repo-assist since its currently burning my personal credits ($70 currently used). If you have a copilot subscription we could perhaps use that instead? https://github.com/fable-compiler/Fable/pull/4433/changes#diff-51df6919d8f391545ee21a8ae6b1060dc702639c08c55ea4b7883a08a4c18684R19

[ncave]

@dbrattli Thanks for letting me know, I was just testing to see if it triggers. No further action needed atm, we have a lot of tech debt across all targets, so we'll have to prioritize.