Use a single flag for log-level in the CLI

[kanishkatn]

Issue summary

Currently, we have several flags to set the log-level of the modules.

• --log to set the global log-level
• Module specific flags (--lcore, --lrpc etc) to set the module log-level

We could use a single flag to accept all the log-levels. For example:
--log global:info, core:debug, rpc:crit

Other information and links

This was noticed during the CLI refactor (#3173) and was decided to pick it up at a later stage

Discussion around the CLI refactor: #3171
CLI refactor main issue: #3163

[danforbes]

Can we make sure that there's an easy way for users to discover all the modules that are available for log-level tuning? It seems like this information will be present in the config file, which is honestly probably all that's necessary. It would also be nice, though, if this was listed clearly in the --help message.

[github-actions]

🎉 This issue has been resolved in version 0.8.0 🎉

The release is available on GitHub release

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