add redshiftserverless workgroup resource

[DrFaust92]

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Relates #24501

Output from acceptance testing:

$ make testacc TESTS=TestAccRedshiftServerlessWorkgroup_  PKG=redshiftserverless
--- PASS: TestAccRedshiftServerlessWorkgroup_disappears (476.81s)
--- PASS: TestAccRedshiftServerlessWorkgroup_basic (489.51s)
--- PASS: TestAccRedshiftServerlessWorkgroup_tags (512.88s)

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccRedshiftServerlessWorkgroup_' PKG=redshiftserverless ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/redshiftserverless/... -v -count 1 -parallel 2  -run=TestAccRedshiftServerlessWorkgroup_ -timeout 180m
=== RUN   TestAccRedshiftServerlessWorkgroup_basic
=== PAUSE TestAccRedshiftServerlessWorkgroup_basic
=== RUN   TestAccRedshiftServerlessWorkgroup_tags
=== PAUSE TestAccRedshiftServerlessWorkgroup_tags
=== RUN   TestAccRedshiftServerlessWorkgroup_disappears
=== PAUSE TestAccRedshiftServerlessWorkgroup_disappears
=== CONT  TestAccRedshiftServerlessWorkgroup_basic
=== CONT  TestAccRedshiftServerlessWorkgroup_disappears
--- PASS: TestAccRedshiftServerlessWorkgroup_basic (511.29s)
=== CONT  TestAccRedshiftServerlessWorkgroup_tags
--- PASS: TestAccRedshiftServerlessWorkgroup_disappears (517.23s)
--- PASS: TestAccRedshiftServerlessWorkgroup_tags (848.05s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/redshiftserverless	1364.018s

[ewbankkit]

@DrFaust92 Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v4.28.0 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.