Added a chart for Percona Server

[CaptTofu]

I needed a Percona Server chart, so I created one, based off of the MySQL chart since the docker images work essentially the same.

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[k8s-ci-robot]

Hi @CaptTofu. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with @k8s-bot ok to test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[CaptTofu]

I signed it!

[CaptTofu]

Howdy! Does anyone need anything from me to get this moving through the process?