Add support for HCP packer

[remyleone]

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[0x557269656C]

Dear friends, I know jack sh*t about packer plugin development, but the amazon builders included support for the HCP Registry some time ago, and perhaps, this search may be useful: https://github.com/hashicorp/packer-plugin-amazon/search?q=registryimage

Also this: https://github.com/hashicorp/packer-plugin-sdk/tree/main/packer/registry/image