[charmed_mysql] Add Charmed MySQL support

[vlad-apostol]

This plugin is intended to add support for Charmed MySQL deployments.
An example of the output for the report can be found here: Charmed MySQL example report

Please note: this PR requires PR #3968 to be merged before this is functional.

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
• sudo dnf install -y dnf-plugins-core on Fedora
• dnf copr enable packit/sosreport-sos-3970
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.

[arif-ali]

Can you squash your commits, so that it's one commit please

[vlad-apostol]

Commits have been squashed

[arif-ali]

one final nit from me

[TurboTurtle]

LGTM, thanks!