feat(route53resolver): improve FirewallRuleGroup import by name

[a-shrey]

Issue

Closes #16335.

Reason for this change

Currently, FirewallRuleGroup allows importing an existing rule group by ID using fromFirewallRuleGroupID() , but there is no built-in way to reference an existing rule group by name. Users need to implement their own lookup logic via the AWS SDK. This change provides a direct method to import a firewall rule group by name, simplifying the process.

Description of changes

• Added FirewallRuleGroup.fromFirewallRuleGroupName(), which allows users to import a firewall rule group using its name instead of just an ID.
• The method retrieves the rule group ID from the CDK context.
• If the provided firewall rule group name is not found in the context, it throws a meaningful error.
• Created unit tests, ensuring correct ID is returned when a valid name mapping is provided in the context and an error is thrown if firewall rule group name is not found in the context.

Describe any new or updated permissions being added

None

Description of how you validated changes

• Unit Tests: Added tests in firewall-rule-group.test.ts to validate both successful and failing cases.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

Acknowledgments

Thanks to @arvchahal for collaboration on this feature!

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

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