Format hcl/nomad filetypes using terraform fmt (#1353)

[prevostcorentin]

Following the PR #1361 related to issue #1353, hcl and nomad filetypes formatting should be done using terraform fmt instead of hclfmt which is an abandoned project.

[jose-elias-alvarez]

Rather than deleting the new hclfmt built-in (which strictly speaking would be a breaking change) could we instead add a note to the documentation that it's abando ned and to use terraform fmt instead?