cmd/version: Introduce JSON output

[radeksimko]

Current Version

0.3.2

Use-cases

The VSCode extension and potentially other IDEs/extensions might want to manage the installation/upgrade of the language server. This would be little easier if they could read JSON output instead of line-based one.

Attempted Solutions

https://github.com/hashicorp/vscode-terraform/blob/1c882b35bb52e834214fad186c167f8ecaf04804/src/languageServerInstaller.ts#L32-L33

Proposal

Introduce terraform-ls version -json which has similar output to the recently introduced terraform version -json: hashicorp/terraform#25252

[radeksimko]

@aeschright I'm aware we just keep updating without letting the user pin the LS to any version - so in the "happy path" this shouldn't cause problem with adoption once we upgrade most people to the version which has JSON output. But does the VSCode extension also check --version for custom installations?

[aeschright]

No, if you set an explicit path to the binary we don't do any further checks.

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