Port opentelemetry code to multichain codebase

[ppca]

Mostly involves porting the tracing-opentelemetry gluecode from the old codebase: https://github.com/near/mpc-recovery/blob/develop/mpc-recovery/src/logging.rs

We also used to have tracing endpoints, but not sure if that's relevant anymore as we are not exposing any user-facing API anymore: https://github.com/near/mpc-recovery/blob/develop/mpc-recovery/src/leader_node/mod.rs#L119-L122

[ppca]

We now have our node logs in gcp, for example: multichain-dev-1

[volovyks]

The logging functionality works, but it is spammed with DEBUG level logs. Can we please change the default severity level to INFO? I've tried severity>=INFO but it has not helped.

[ppca]

Seems the SEVERITY level only applies to log from GCP side, not logs from multichain service. I'm working with Kody on this

[ppca]

Looks like we can port severity level by using this library to set up the global logging subscriber: https://github.com/NAlexPear/tracing-stackdriver

[volovyks]

Is it compatible with our current tracing APIs? If not, I would not invest time in it now. Feel free to move it back to backlog if it's time-consuming.

[ppca]

not entirely sure. I'll move it back to backlog for now.