Support for STIG controls V4 Module in terraform [code, tests, docs and example]

[Haroon-Dweikat-Ntx]

What this PR does

• Introduces a new Terraform data source: nutanix_stigs_v2.
• Uses the Nutanix V4 Security API (List STIGs endpoint) to fetch and expose Security Technical Implementation Guide (STIG) controls.
• Allows Terraform users to query available STIGs directly and reference them in their configurations.

Why this is needed

• Provides Terraform support for managing and integrating STIG compliance controls from the Nutanix V4 API.
• Enables automation and policy enforcement by letting users consume STIG definitions programmatically.
• Ensures consistency across infrastructure by exposing STIG data for use in Terraform-managed workflows.

How it was tested

• Implemented and ran local builds of the provider with the new data source.
• Queried the nutanix_stigs_v2 data source against a Nutanix environment with available STIGs.
• Verified returned attributes match the V4 API response schema (e.g., extId, title, ruleId).
• Confirmed Terraform plan/apply outputs display the expected STIG details.

[Haroon-Dweikat-Ntx]

/ok-to-test TestAccV2NutanixStigsControlsDatasource

• 🧪 Build Status: success
• 📌 GitHub Action: View GitHub Actions Run
• 📊 Code Coverage: Current line coverage (1.2) is below threshold (50). Kindly add more acceptance tests.
• 📝 Test Summary:

==================================================🧪 TEST SUMMARY 🧪=================================================================================
Total Test Cases Run 🚀: 2
Total Test Cases Passed ✅: 2 (100 %)
Total Test Cases Failed ❌: 0 (0 %)
Total Test Cases Skipped ⚠️: 0 (0 %)
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================================================== TESTS SUCCEEDED ✅ =============================================================================

✅ TestAccV2NutanixStigsControlsDatasource_Basic
✅ TestAccV2NutanixStigsControlsDatasource_Filtered
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================================================== TESTS FAILED ❌ ================================================================================
🎉💃 No tests failed 🕺🎉
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================================================== TESTS SKIPPED ⚠️ ==============================================================================
🎉💃 No tests skipped 🕺🎉
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