feat: Add nomad fmt

[Trojan295]

This PR adds the nomad fmt command, which can be used to format and check Nomad configuration and jobspec files.

It formats the files according to the HCL syntax using hashicorp/hcl. It does not validate, if the files are correct Nomad or Jobspec files.

Closes #11757

[hashicorp-cla]

All committers have signed the CLA.

[tgross]

Hi @Trojan295! This is great!

I've left some comments that can tighten this up and make it more consistent with both terraform fmt and the rest of the Nomad code base. Two more things:

• You can add a changelog file. You'll make that at .changelog/14779.txt and it'll look like https://github.com/hashicorp/nomad/blob/main/.changelog/14742.txt.
• There's documentation at ./website/content/docs/commands. You can take a crack at mimicking the files in the top of that directory, but if that's too overwhelming just let me know and I can knock that out pretty quickly once this is ready to merge.

Thanks again!

[tgross]

Looking great @Trojan295! Just a few last items to fix up and we'll be able to land this one.

[tgross]

Let's fix the newlines at the end of these files.

[Trojan295]

Thanks @tgross for the review! I will update this PR tomorrow. :)

[Trojan295]

I pushed the changes.

Instead of putting the testdata files as const into the Go source, I added to ignore the ./command/testdata by make hclfmt.
I kinda like it more to keep them separate, but if you prefer to include this in the Go sources, I can change this also.

[tgross]

Looks great, @Trojan295! Thanks for sticking with it, I know PRs for new commands can feel like a whole lot of nitpicking 😀

CircleCI seems to have gotten confused about the PR and can't run the build. So I just rebased this branch on main to get that moving again. Once that finishes, we can get this merged. (I'll probably have to do that tomorrow morning, as I'm close to end-of-day here.) Done

[tgross]

@Trojan295 this has been merged and a backport bot will merge it to the 1.4.x release branch for the next patch release of Nomad . If that bot can't figure things out and requests a review from you, don't worry about it and I'll fix it in the morning; it's one of those fiddly process things we try not to expose to contributors but the bot is working thru a bit of a queue at the moment and I won't be there to immediately catch it. 😀

[Trojan295]

Looks great, @Trojan295! Thanks for sticking with it, I know PRs for new commands can feel like a whole lot of nitpicking 😀

Wasn't so bad :). I just had a though, that it would be nice, if some of those docs/CLI help could be generated. E.g. we have the help in mdx and this gets automatically added to the website and also the CLI help is generated out of it.

[tgross]

I just had a though, that it would be nice, if some of those docs/CLI help could be generated.

Yes! I know a few folks have been tinkering around with better CLI generation internally for that reason.

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