Add Vultr Snapshot builder

[ddymko]

Vultr Builder for Vultr Snapshots

Adds the following builder:

• Vultr

Based on https://github.com/vultr/packer-builder-vultr
(originally maintained by @ivandeex)

Relates to #8041

[hashicorp-cla]

All committers have signed the CLA.

[SwampDragons]

Hi @ddymko, sorry for the late response -- I was at HashiConf so the issue tracker and Pull Request queue fell a bit by the wayside :)

Internally, we've been having a conversation about whether it makes sense to keep merging third party builders that we (HashiCorp) don't have the engineering resources to officially support -- I think it's been causing confusion in the community to have the officially-supported and community-supported plugins in the same place, and it makes the issue tracker a bit cluttered.

I'm working on a roadmap that will hopefully come up with a solution that makes managing plugins a bit more seamless so that users don't have to worry about compiling, etc... but I think for now at least we're not going to be merging new builders until that path forward has been figured out.

I'm happy to leave this open while we're deliberating on that, but it'll be a while and my suspicion at this point is that we're going to end up saying "keep it separate".

Thanks for opening this!

[SwampDragons]

We've officially decided to go the route of a "packer init" type feature, which we're hoping to roll out this year. With that in mind, I am going to close this PR, and I'll create a meta-issue to make sure that any builders added to our community pages get incorporated into the registry we create.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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