Support for cdktf diff

[anubhavmishra]

• Implement terraform cli wrapper to run terraform commands
• Implement parsing terraform plan JSON output
• Display cdktf diff output using terraform plan

[anubhavmishra]

TODO:

• Add the complete summary for the diff.
• remove the unique id from first-class Terraform resources

[skorfmann]

• Prettify module output to match a tree format.

#113

[anubhavmishra]

Expected output: #91 (comment)

[github-actions]

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