New Resource: aws rds cluster activity stream

[jdstuart]

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Description: This PR adds support for the Amazon Aurora Database Activity Streams.

Credit goes to the original author of #14243 for his contributions.

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Output from acceptance testing:

make testacc TESTARGS='-run=TestAccAWSRDSClusterActivityStream_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSRDSClusterActivityStream_ -timeout 120m
=== RUN   TestAccAWSRDSClusterActivityStream_basic
=== PAUSE TestAccAWSRDSClusterActivityStream_basic
=== RUN   TestAccAWSRDSClusterActivityStream_disappears
=== PAUSE TestAccAWSRDSClusterActivityStream_disappears
=== RUN   TestAccAWSRDSClusterActivityStream_kmsKeyId
=== PAUSE TestAccAWSRDSClusterActivityStream_kmsKeyId
=== RUN   TestAccAWSRDSClusterActivityStream_mode
=== PAUSE TestAccAWSRDSClusterActivityStream_mode
=== RUN   TestAccAWSRDSClusterActivityStream_resourceArn
=== PAUSE TestAccAWSRDSClusterActivityStream_resourceArn
=== CONT  TestAccAWSRDSClusterActivityStream_basic
=== CONT  TestAccAWSRDSClusterActivityStream_resourceArn
=== CONT  TestAccAWSRDSClusterActivityStream_kmsKeyId
=== CONT  TestAccAWSRDSClusterActivityStream_mode
=== CONT  TestAccAWSRDSClusterActivityStream_disappears
--- PASS: TestAccAWSRDSClusterActivityStream_disappears (1257.30s)
--- PASS: TestAccAWSRDSClusterActivityStream_basic (1718.78s)
--- PASS: TestAccAWSRDSClusterActivityStream_mode (2176.32s)
--- PASS: TestAccAWSRDSClusterActivityStream_kmsKeyId (2043.42s)
--- PASS: TestAccAWSRDSClusterActivityStream_resourceArn (2513.59s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       2539.247s

[github-actions]

Welcome @jdstuart 👋

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Thanks again, and welcome to the community! 😃

[github-actions]

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