Add AWS RDS Proxy plugin

[wojtekk]

Creates proxy to AWS RDS Cluster or Instance.

It uses the plugin net-forward under the hood.

Documentation and example: kubectl-aws-rds-proxy

[ahmetb]

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/kind new-plugin

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: wojtekk
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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: wojtekk / name: Wojciech Krawczyk (9e022b7, cae28d4)

[k8s-ci-robot]

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[ahmetb]

Hi, please refer to the naming document on the website. https://krew.sigs.k8s.io/docs/developer-guide/develop/naming-guide/
Typically we reserve vendor prefixes to plugins from vendors themselves.