Add ctr plugin

[cfanbo]

kubectr is a utility that displays all containers in a pod, supporting both initContainers and ephemeralContainers.

[ahmetb]

🤖 Beep beep! I’m a robot speaking on behalf of @ahmetb. 🤖

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Thanks for submitting your kubectl plugin to Krew!
One of the krew-index maintainers will review it soon. Note that the reviews for new plugin submissions may take a few days.

In the meanwhile, here are a few tips to make your plugin manifest better:

• Make sure your plugin follows the best practices.
• Eliminate redundant wording form shortDescription (it should be max 50 characters).
• Try to word wrap your description to 80-character lines (no usage examples, please).

Thanks for your patience!
/kind new-plugin

[linux-foundation-easycla]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: cfanbo
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[k8s-ci-robot]

Welcome @cfanbo!

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