feat: Add Terraform import resource name validation (closes #1)

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Terraform Resource Name Validation

This PR adds validation for Terraform import resource names to prevent state corruption.

Changes:

• Added validate_resource_name(): Validates individual resource names
• Added validate_resource_names(): Validates lists of resources
• Rejects hyphenated names with clear error messages
• Comprehensive unit tests

Acceptance Criteria:

• Validate resource names before import
• Reject hyphenated names with actionable errors
• Preserve existing behavior for valid names
• Tests for valid, invalid, and edge cases

Test Results:

test_valid_name ... ok
test_valid_with_underscores ... ok
test_hyphenated_name ... ok
test_name_starting_with_number ... ok
test_empty_name ... ok
test_name_with_spaces ... ok
test_underscore_only ... ok
test_all_valid ... ok
test_mixed_valid_invalid ... ok

Ran 9 tests in 0.001s
OK

Validation Rules:

• No hyphens (causes Terraform state corruption)
• Must start with letter or underscore
• Only alphanumeric characters and underscores

Closes #1

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Bounty: $40
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