Enable Tokio-Console in Sui for debugging

[velvia]

For more details on Tokio Console:
https://docs.rs/tokio-console/latest/tokio_console/

This will give us visibility into running tasks and resources Tokio uses.

[huitseeker]

This makes sense to me, for now! Perhaps add a comment 'this is meant to enable Tokio console and we plan to revisit this variable post testnet' on the Tokio experimental env var?

[velvia]

Actually I'm not sure this is going to work.
I can connect with Tokio-console to a Sui-node binary compiled by these changes, and with TOKIO_CONSOLE=true env var. However, no tasks are displayed.

I followed all the recommendations in https://docs.rs/console-subscriber/0.1.7/console_subscriber/#enabling-tokio-instrumentation

You have to enable TRACE logs for Tokio and tracing, which just spews an unacceptable amount of logs. And even after that I still am not getting any instrumentation. Granted I had no transactions, but I should be able to see something happening just with consensus and checkpoints, etc.

[velvia]

Update: Newer version of Mysten-infra fixed the issue so Tokio Console is working now.