ipfs-cluster-service: allow to select logging facilities and level

[hsanjuan]

Describe the feature you are proposing

Rework --loglevel flag so that specific component logging can be selected. Or leave this flag as it is and provide new flags/ways of selecting logging components. Allow the user to inspect the existing logging facilities and the default log-level that they are using.

Additional context

Current approach is pretty much log all or nothing.

[kishansagathiya]

Allow the user to inspect the existing logging facilities and the default log-level that they are using.

log.json with identifier to logleve map in ~/.ipfs-cluster will give user ability to customize logs for multiple cluster runs

To weed out unwanted for just current run a --skip-log-fac could be provided.

[hsanjuan]

Thinking more of exposing /health/logs or the sort. Not going to handle another configuration file for this.

There are two parts:

• Letting ipfs-cluster-service set the right log levels and facilities on boot (flags can also be mapped to env vars)
• Allowing to inspect/change at runtime.

Can be done in separate PRs.