Support cdktf deploy

[skorfmann]

• cdktf synth
• terraform init
• get / show the plan similar to cdktf diff
• confirm to continue
• display a live updating list of resources during deploy
• show terraform outputs if any.

[anubhavmishra]

@skorfmann ideally, we want to use the plan generated in cdktf diff when running terraform apply -auto-approve [PLAN], I think that will guarantee only the plan that is confirmed is the one that is applied via Terraform.

[skorfmann]

Implemented in #106

[github-actions]

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