test: add example project for testing terragrunt dependency

test_examples/cross_project_dependencies/app/main.tf

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+variable "role_name" {
+  description = "Name of the role we want to bring in"
+  type        = string
+}
+
+output "role_name" {
+  value = var.role_name
+}

test_examples/cross_project_dependencies/app/terragrunt.hcl

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+dependency "roles" {
+  config_path = "../roles"
+  mock_outputs = {
+    role_arn = "placeholder"
+  }
+}
+
+inputs = {
+  role_arn = dependency.roles.outputs.role_arn
+}

test_examples/cross_project_dependencies/roles/main.tf

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+resource "aws_iam_role" "test_role" {
+  name = "test_role_terragrunt_atlantis_project"
+
+  assume_role_policy = data.aws_iam_policy_document.policy.json
+}
+
+data "aws_iam_policy_document" "policy" {
+  statement {
+    actions = ["sts:AssumeRole"]
+
+    principals {
+      type        = "Service"
+      identifiers = ["ec2.amazonaws.com"]
+    }
+  }
+}
+
+output "role_name" {
+  value = aws_iam_role.test_role.name
+}

test_examples/cross_project_dependencies/roles/terragrunt.hcl

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+include {
+  path = find_in_parent_folders()
+}
+