feature: Add logging endpoint for synapse devices

[gilbert-sci]

Summary

• Adds logging.proto
  • Defines a log entry
  • Defines requests for logs
• Adds GetLogs
• Adds TailLogs

Discussion

• Should we discriminate on the timestamp source? I just use google's timestamp here, but we might want to describe if it is monotonic or system time (since the current SciFi device doesn't have persistent system time)

[antoniaelsen]

very nice, tyvm!

In Nexus we use uint64 ns timestamps but I don't have strong opinions for synapse. Just worth noting in case we want consistency

[gilbert-sci]

I can update it to be timestamp_ns, that is nice if that is what we prefer. I sometimes defer to the sec.nsec because more systems support it/matches how linux does time.