Consider a specific logger channel for CLI commands

Problem/Motivation

Split as a follow-up from https://git.drupalcode.org/project/drupal/-/merge_requests/14902#note_80... where @longwave writes:

Should we consider a specific logger channel for commands (or recipes)?

@mradcliffe replied:

I think that is something to consider in the meta/initiative.
If contrib starts experimenting, then contrib will probably use the logger channel for their module, right? So this would only apply to core for the most part.

Steps to reproduce

Proposed resolution

TBD.

Perhaps introduce a new 'Commands' or 'CLI' or something logger channel and have all the core commands that log anything use that.

Remaining tasks

1. Decide what to do.
2. Perhaps get UX review?
3. Do it.

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet