Add ability to specify base image by name

[dm3ch]

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Description

Right now builder supports referencing base images only by ID or by Slug. But slug couldn't be used for self-built images, as far as I found in docs.

In current documentation it seems that using image name is possible, but it isn't so - https://github.com/hashicorp/packer-plugin-digitalocean/blob/main/builder/digitalocean/config.go#L43-L47

Use Case(s)

It would allow referencing image without ID for self-built base images.

Potential configuration

Potential References

digitalocean/godo#521

[andrewsomething]

This seems like it might be a good fit for the new-ish Data Source component type.

https://www.hashicorp.com/blog/announcing-the-packer-data-source-component-type