d/aws_rds_clusters: new data source

[kamilturek]

Description

This PR introduces the aws_rds_clusters plural data source.

References

https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_DescribeDBClusters.html

Output from Acceptance Testing

$ make testacc TESTARGS='-run=TestAccRDSClustersDataSource_filter' PKG=rds ACCTEST_PARALLELISM=2    
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 2  -run=TestAccRDSClustersDataSource_filter -timeout 180m
=== RUN   TestAccRDSClustersDataSource_filter
=== PAUSE TestAccRDSClustersDataSource_filter
=== CONT  TestAccRDSClustersDataSource_filter
--- PASS: TestAccRDSClustersDataSource_filter (171.03s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/rds        172.860s

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccRDSClustersDataSource_' PKG=rds ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 2  -run=TestAccRDSClustersDataSource_ -timeout 180m
=== RUN   TestAccRDSClustersDataSource_filter
=== PAUSE TestAccRDSClustersDataSource_filter
=== CONT  TestAccRDSClustersDataSource_filter
--- PASS: TestAccRDSClustersDataSource_filter (181.78s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	186.189s

[ewbankkit]

@kamilturek Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v4.41.0 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. Thank you!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.