Add Tag Support to API Gateway Domain Name Resource

[DrFaust92]

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Relates #8744

Release note for CHANGELOG:

- resource/resource_aws_api_gateway_domain_name: Add `tags` argument.

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSAPIGatewayDomainName_'

=== RUN   TestAccAWSAPIGatewayDomainName_CertificateArn
--- SKIP: TestAccAWSAPIGatewayDomainName_CertificateArn (0.00s)
    resource_aws_api_gateway_domain_name_test.go:19: Environment variable AWS_API_GATEWAY_DOMAIN_NAME_CERTIFICATE_ARN is not set. This environment variable must be set to the ARN of an ISSUED ACM certificate in us-east-1 to enable this test.

Test ignored.
=== RUN   TestAccAWSAPIGatewayDomainName_CertificateName
--- SKIP: TestAccAWSAPIGatewayDomainName_CertificateName (0.00s)
    resource_aws_api_gateway_domain_name_test.go:57: Environment variable AWS_API_GATEWAY_DOMAIN_NAME_CERTIFICATE_BODY is not set. This environment variable must be set to any non-empty value with a publicly trusted certificate body to enable the test.

Test ignored.
=== RUN   TestAccAWSAPIGatewayDomainName_RegionalCertificateArn
=== PAUSE TestAccAWSAPIGatewayDomainName_RegionalCertificateArn
=== CONT  TestAccAWSAPIGatewayDomainName_RegionalCertificateArn
--- PASS: TestAccAWSAPIGatewayDomainName_RegionalCertificateArn (110.27s)
=== RUN   TestAccAWSAPIGatewayDomainName_RegionalCertificateName
--- SKIP: TestAccAWSAPIGatewayDomainName_RegionalCertificateName (0.00s)
    resource_aws_api_gateway_domain_name_test.go:151: Environment variable AWS_API_GATEWAY_DOMAIN_NAME_REGIONAL_CERTIFICATE_NAME_ENABLED is not set. This environment variable must be set to any non-empty value in a region where uploading REGIONAL certificates is allowed to enable the test.

Test ignored.
=== RUN   TestAccAWSAPIGatewayDomainName_SecurityPolicy
=== PAUSE TestAccAWSAPIGatewayDomainName_SecurityPolicy
=== CONT  TestAccAWSAPIGatewayDomainName_SecurityPolicy
--- PASS: TestAccAWSAPIGatewayDomainName_SecurityPolicy (162.39s)
=== RUN   TestAccAWSAPIGatewayDomainName_Tags
=== PAUSE TestAccAWSAPIGatewayDomainName_Tags
=== CONT  TestAccAWSAPIGatewayDomainName_Tags
--- PASS: TestAccAWSAPIGatewayDomainName_Tags (159.41s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	169.083s

...

[bflad]

LGTM, thanks @DrFaust92 🚀

--- PASS: TestAccAWSAPIGatewayDomainName_SecurityPolicy (19.30s)
--- PASS: TestAccAWSAPIGatewayDomainName_Tags (106.29s)
--- PASS: TestAccAWSAPIGatewayDomainName_RegionalCertificateArn (113.13s)

[ghost]

This has been released in version 2.35.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!