Add WAF Regional IP set data source

[ryndaniels]

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Relates #2654

Release note for CHANGELOG:

* **New Data Source** `aws_wafregional_ipset`

Output from acceptance testing:

$ make testacc TESTARGS="-run=TestAccDataSourceAwsWafRegionalIPSet"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -parallel 20 -run=TestAccDataSourceAwsWafRegionalIPSet -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccDataSourceAwsWafRegionalIPSet_Basic
=== PAUSE TestAccDataSourceAwsWafRegionalIPSet_Basic
=== CONT  TestAccDataSourceAwsWafRegionalIPSet_Basic
--- PASS: TestAccDataSourceAwsWafRegionalIPSet_Basic (38.33s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       44.963s

Local screenshot of docs:

[bflad]

Two nitpicks, but otherwise looks fantab. 🎉

--- PASS: TestAccDataSourceAwsWafRegionalIPSet_Basic (18.65s)

[bflad]

This has been released in version 2.21.0 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, documentation updates, 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!