Add support resource import for aws wafregional rate based rule resource

[teraken0509]

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Relates #9620

Release note for CHANGELOG:

resource/aws_wafregional_rate_based_rule: Support resource import

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSWafRegionalRateBasedRule_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAWSWafRegionalRateBasedRule_ -timeout 120m
=== RUN   TestAccAWSWafRegionalRateBasedRule_basic
=== PAUSE TestAccAWSWafRegionalRateBasedRule_basic
=== RUN   TestAccAWSWafRegionalRateBasedRule_changeNameForceNew
=== PAUSE TestAccAWSWafRegionalRateBasedRule_changeNameForceNew
=== RUN   TestAccAWSWafRegionalRateBasedRule_disappears
=== PAUSE TestAccAWSWafRegionalRateBasedRule_disappears
=== RUN   TestAccAWSWafRegionalRateBasedRule_changePredicates
=== PAUSE TestAccAWSWafRegionalRateBasedRule_changePredicates
=== RUN   TestAccAWSWafRegionalRateBasedRule_changeRateLimit
=== PAUSE TestAccAWSWafRegionalRateBasedRule_changeRateLimit
=== RUN   TestAccAWSWafRegionalRateBasedRule_noPredicates
=== PAUSE TestAccAWSWafRegionalRateBasedRule_noPredicates
=== CONT  TestAccAWSWafRegionalRateBasedRule_basic
=== CONT  TestAccAWSWafRegionalRateBasedRule_changeRateLimit
=== CONT  TestAccAWSWafRegionalRateBasedRule_noPredicates
=== CONT  TestAccAWSWafRegionalRateBasedRule_disappears
=== CONT  TestAccAWSWafRegionalRateBasedRule_changePredicates
=== CONT  TestAccAWSWafRegionalRateBasedRule_changeNameForceNew
--- FAIL: TestAccAWSWafRegionalRateBasedRule_disappears (50.17s)
    testing.go:568: Step 0 error: errors during apply:

        Error: Error creating WAF Regional Rate Based Rule (): WAFLimitsExceededException: Operation would result in exceeding resource limits.
        	status code: 400, request id: f4738384-b684-11e9-9455-ef575923e2eb

          on /var/folders/w9/yq_zm9bj24z06tlty8163139j7txby/T/tf-test496410440/main.tf line 11:
          (source code not available)


--- PASS: TestAccAWSWafRegionalRateBasedRule_noPredicates (53.22s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_changeRateLimit (72.60s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_basic (80.40s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_changePredicates (98.57s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_changeNameForceNew (113.13s)
FAIL
FAIL	github.com/terraform-providers/terraform-provider-aws/aws	113.218s
make: *** [testacc] Error 1

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSWafRegionalRateBasedRule_disappears'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAWSWafRegionalRateBasedRule_disappears -timeout 120m
=== RUN   TestAccAWSWafRegionalRateBasedRule_disappears
=== PAUSE TestAccAWSWafRegionalRateBasedRule_disappears
=== CONT  TestAccAWSWafRegionalRateBasedRule_disappears
--- PASS: TestAccAWSWafRegionalRateBasedRule_disappears (46.93s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	47.019s

[bflad]

Looks good, thanks @kterada0509 🚀

--- PASS: TestAccAWSWafRegionalRateBasedRule_disappears (23.50s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_changePredicates (39.79s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_changeNameForceNew (48.29s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_basic (51.57s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_changeRateLimit (58.54s)
--- PASS: TestAccAWSWafRegionalRateBasedRule_noPredicates (69.87s)

[ghost]

This has been released in version 2.23.0 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!