magerun config commands

[cmuench]

Magerun pull-request check-list:

• Pull request against develop branch (if not, just close and create a new one against it)
• README.md reflects changes (if any)
• phar fuctional test (in tests/phar-test.sh)

Summary: New commands to dump and verify the Magerun configuration

Fixes #1595

Changes proposed in this pull request:

• Add the command magerun:config:dump
• Add the command magerun:config:info

[github-actions]

Download the artifacts for this pull request:

• n98-magerun2.phar.zip