Review and clean up logging system

Rez uses a mix of traditional logs using the `logging` library and print statements. It's quite a mess. This issue tracks the work needed to revamp our logging.

* Replace all the debug_xxx stuff with standard python loggers, which just have their levels set based on each `debug_xxx` config setting.
* https://rez.readthedocs.io/en/stable/configuring_rez.html#debugging
* https://rez.readthedocs.io/en/stable/configuring_rez.html#quiet
* https://rez.readthedocs.io/en/stable/configuring_rez.html#show_progress
* Handle log colors: https://rez.readthedocs.io/en/stable/configuring_rez.html#colorization
* A library like [rich](https://rich.readthedocs.io/en/latest/) could be helpful.

One thing to be careful with is that we probably don't want to introduce breaking changes to the output just yet, unless necessary.

Before starting to write/rewrite code, please provide a plan as this is a central part of rez and it will save time for both you and maintainers if we align on a solution before starting to implement anything.

Related issues: https://github.com/AcademySoftwareFoundation/rez/issues?q=is%3Aissue%20state%3Aopen%20label%3Alogging

No source files or tests are named. Start by tracing the debug_xxx settings documented under debugging, quiet, show_progress, and colorization, then inventory the logging-library and print usage. The first deliverable is a maintainer-approved plan that avoids output changes unless necessary; implementation is complete when the logging behavior and color handling are consistently covered.

Written by the indexing model from the issue text.