Serde: Support MessagePack

[grietine]

Issue submitter TODO list

• I've searched for an already existing issues here
• I'm running a supported version of the application which is listed here and the feature is not present there

Is your proposal related to a problem?

No response

Describe the feature you're interested in

I would be grateful to have MessagePack support and see it as one of the Serde dropdown selections 😄
https://msgpack.org/index.html

Describe alternatives you've considered

No response

Version you're running

4cf17a0 v1.1.0

Additional context

No response

[github-actions]

Hi grietine! 👋

Welcome, and thank you for opening your first issue in the repo!

Please wait for triaging by our maintainers.

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If you plan to raise a PR for this issue, please take a look at our contributing guide.

[Haarolean]

Our capacity to implement third-party serdes is limited. We'd be happy to host this as an official serde within our repos if someone's willing to submit a PR. Alternatively, this could be done via sponsorship.