feat(terraform_plan): Support after_unknown evaluation of complex attributes

[bo156]

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Dear maintainer, below is a concise technical summary of the changes proposed in this PR:

Introduce support for evaluating complex attributes with after_unknown values in Terraform plans. The plan_parser.py now includes a new function _handle_complex_after_unknown to manage nested keys with after_unknown values. This change is tested with a new JSON test file tfplan.json and a corresponding test case test_after_unknown_handling in test_plan_parser.py.

Topic	Details
Test Case Addition	Add a new test case test_after_unknown_handling to verify the handling of complex after_unknown attributes using a mock environment variable. Modified files (1) tests/terraform/parser/test_plan_parser.py Latest Contributors(2) Email Commit Date maxamel2002@gmail.com feat-terraform_plan-ad... September 04, 2024 28880387+tsmithv11@use... fix-terraform_plan-Fix... July 29, 2024
Test Resource File	Include a new test resource file tfplan.json to simulate Terraform plan scenarios with after_unknown attributes. Modified files (1) tests/terraform/parser/resources/plan_after_unknown/tfplan.json Latest Contributors(0) Email Commit Date
Complex Attribute Handling	Enhance the plan_parser.py to handle complex attributes with after_unknown values by introducing _handle_complex_after_unknown. Modified files (1) checkov/terraform/plan_parser.py Latest Contributors(2) Email Commit Date maxamel2002@gmail.com feat-terraform_plan-ad... September 04, 2024 28880387+tsmithv11@use... fix-terraform_plan-Fix... July 29, 2024

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