feat(terraform): Mask secret values in Terraform plan file reports by resource

[arielkru]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Description

• This PR enables masking secret values that are not classified as secrets.
• The solution is a general one, implemented only in tf plan runner for now, for 3 types of resource & attributes that their values should be hidden (azurerm_key_vault_secret: value, aws_secretsmanager_secret_version: secret_string, google_kms_secret_ciphertext: plaintext).
• Can be extended to future runners by adding the resource_attributes_to_omit map when calling omit_secret_value_from_checks()

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[gruebel]

nice work, added few minor suggestions

[gruebel]

🍸