[FEATURE]: list all profiles

[shahzebsiddiqui]

Please describe your feature

add a command buildtest config profiles list to report a list of profiles. The command will display a list of profiles as raw text similar to buildtest config compilers.

We should have an option --yaml to print output of all profiles in yaml format.
We can consider rendering output so let's have --theme option so we can use rich.syntax to print output in different themes

TODO

• Add command menu in argparse https://github.com/buildtesters/buildtest/blob/devel/buildtest/cli/__init__.py
• Add implementation https://github.com/buildtesters/buildtest/blob/devel/buildtest/cli/config.py
• Add entry in buildtest help config https://github.com/buildtesters/buildtest/blob/devel/buildtest/cli/help.py
• Add option in bash completion script
• Add regression test in https://github.com/buildtesters/buildtest/blob/devel/tests/cli/test_config.py
• Add documentation in https://buildtest.readthedocs.io/en/devel/configuring_buildtest.html

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