[charmed_mongos] feat: Add Charmed Mongos plugin

[Gu1nness]

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This is very similar to #4278 for the Mongos router that is used when using sharded mongodb.

[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo dnf install -y 'dnf*-command(copr)'
• dnf copr enable packit/sosreport-sos-4279
• And now you can install the packages.

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

[arif-ali]

can you do a rebase instead, so that you only have your commit please

[Gu1nness]

@arif-ali Done, thanks for the heads up.

[arif-ali]

some comments, similar to mongod one