feat: add support for OpenTofu IaC scanning

[MartinideLimon]

Add support for scanning OpenTofu configuration files (.tofu and .tofu.json extensions) alongside existing Terraform support.

Changes:

• Add new input types: OpenTofuHCL, OpenTofuPlan, OpenTofuState, and OpenTofu aggregate type
• Implement OpenTofuDetector with separate detection logic for .tofu files
• Update parser to recognize .tofu and .tofu.json extensions
• Register OpenTofu detector in Auto mode for automatic detection
• Add comprehensive tests for OpenTofu file and directory detection

OpenTofu is a Terraform-compatible open-source IaC tool. This implementation
maintains separation between Terraform and OpenTofu types, while reusing the same HCL parser since they are compatible.

[CLAassistant]

All committers have signed the CLA.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

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