[#1] [ BOUNTY] Add Terraform resource name validation before import

[lushan888]

Summary

Add explicit validation for Terraform resource names before import operations, preventing hyphenated names (which cause state corruption) and other invalid identifiers from reaching terraform import.

Changes

• tools/terraform_import.py: Add ResourceToImport.validate_resource_name() static method that checks for valid HCL identifiers. Validation runs in main() before any import, dry-run, or script generation — invalid names are rejected early with actionable error messages.
• tools/test_terraform_validation.py: 4 tests covering valid names, invalid names (hyphenated, starts with digit, empty, special chars), mixed validation, and CSV-driven import flow.

Testing

• 4/4 tests pass
• Valid names: my_resource, resource_123, _private_resource, a, MyAWSInstance
• Invalid names: my-resource (specific hyphen error message), 123resource, ``, , `my.resource`, `resource@name`

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated, if applicable
• Configuration or schema changes are documented, if applicable
• No generated build artifacts are committed, except the required diagnostic build log
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

Closes #1