Add oadp plugin

[Joeavaikath]

Add oadp-cli plugin for the oadp-operator

[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.
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Thanks for your patience!
/kind new-plugin

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Joeavaikath / name: Joseph Antony Vaikath (8cec231, 285b4df, e666764, 1f84542)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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