Tracing dm

[freesig]

PR summary

This adds tracing so I plan for this PR to be small and merged quickly to avoid conflicts 🚀
Adds neater traces to capture direct messages.
Before merge:

• Merge Tracing pt. 1 #1925
• Release holochain_tracing 0.020
• Update lib3h to use new holochain-tracing bump tracing version lib3h#513

testing/benchmarking notes

( if any manual testing or benchmarking was/should be done, add notes and/or screenshots here )

followups

( any new tickets/concerns that were discovered or created during this work but aren't in scope for review here )

changelog

• if this is a code change that effects some consumer (e.g. zome developers) of holochain core, then it has been added to our between-release changelog with the format

- summary of change [PR#1234](https://github.com/holochain/holochain-rust/pull/1234)

documentation

• this code has been documented according to our docs checklist

[freesig]

I've found a better option. Tokio tracing already has a Jaeger backend through open telemetry and its way easier to write