Terragrunt support

[hugorut]

Infracost VSCode extension currently does not support Terragrunt as the Infracost CLI uses a different method to evaluate Terragrunt configuration files. To support Terragrunt, we need to change the evaluation method to hold contextual block information with file names and numbers.

In the interim, we could add partial support for Terragrunt users, where we show cost estimates on Terraform modules that Terragrunt uses.

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