feat: Synthesis in HCL

[mutahhir]

Related issue

Fixes #225

Description

Add support for CDKTF to synthesize code to HCL Terraform instead of just JSON. While we are trying to ensure that HCL generation is as good as the existing JSON synthesis, care is requested when using it as JSON synthesis is much better tested and robust.

In order to use HCL output, the --hcl flag can be passed on to the synth command (e.g. cdktf synth --hcl).

Warning

Please note that we currently don't erase / remove existing JSON files, so care has to be exercised when using both cdktf synth along with cdktf synth --hcl as terraform will try to use both files if present and that will cause problems.

Checklist

• Ensure all tests pass
• Add documentation section for HCL output
• Add tests for --hcl flag
• Add support for import block
• Add breaking change changelog entry for removed backends

Missing features / Problems

• Some keywords may be quoted when not necessary. e.g. when = destroy will be when = "destroy" within the provisioner block.
• Overrides do not contain enough type information, so they may be rendered incorrectly. We try our best to find the right rendering, but it's not always possible.

[github-actions]

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