feat!: add Terraform 0.13 constraint and module attribution

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[tpdownes]

@morgante I'm curious if the 0.13.0 constraint is being imposed solely because of the required_providers blocks? If so, they announced that feature in 0.13.0 but backported to 0.12.20:

https://github.com/hashicorp/terraform/blob/v0.12/CHANGELOG.md#01220-january-22-2020

Google Cloud Shell version of Terraform remains pretty low and some users choose to move slowly (for better/worse).

If the GitHub tags are to be believed, provider_meta appears to be truly 0.13.0+.

[bharathkkb]

@tpdownes this constraint was primarily to support provider_meta which would otherwise cause issues like terraform-google-modules/terraform-google-network#235

[tpdownes]

Yeah, I see that. It's unfortunate terraform can't silently fail on it. But, I only really see one new feature between 3.0.1 and 4.0.0 so it doesn't much matter. Thanks!