Implement textDocument/formatting

[radeksimko]

Closes #28

[radeksimko]

I'm half thinking if it's worth still replacing the hclwrite.Format with a call out to terraform fmt. We receive bytes from there anyway.

The only downside is a little more plumbing/mocking in tests and potentially different failure scenarios, but I'm still leaning more towards doing it.

[aeschright]

I think this looks good, aside from making a decision on that detail.

[musabmasood]

Dumb question, how can I enable this in vscode? terraform fmt doesn't seem to be running on save. Just updated to 2.0.1 plugin, everything else seems to be working fine.

[aeschright]

It uses the VSCode settings here: hashicorp/vscode-terraform#375 (comment)

You won't see a call out to terraform fmt specifically because it's routed through the language server.

[ghost]

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