Add support import for aws_waf_rate_based_rule resource

[DrFaust92]

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Relates #9212

Release note for CHANGELOG:

resource/aws_waf_rate_based_rule: Support resource import

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSWafRateBasedRule_'

=== RUN   TestAccAWSWafRateBasedRule_basic
=== PAUSE TestAccAWSWafRateBasedRule_basic
=== CONT  TestAccAWSWafRateBasedRule_basic
=== RUN   TestAccAWSWafRateBasedRule_changeNameForceNew
=== PAUSE TestAccAWSWafRateBasedRule_changeNameForceNew
=== RUN   TestAccAWSWafRateBasedRule_disappears
=== PAUSE TestAccAWSWafRateBasedRule_disappears
=== CONT  TestAccAWSWafRateBasedRule_disappears
=== RUN   TestAccAWSWafRateBasedRule_changePredicates
=== PAUSE TestAccAWSWafRateBasedRule_changePredicates
=== CONT  TestAccAWSWafRateBasedRule_changePredicates
=== RUN   TestAccAWSWafRateBasedRule_noPredicates
=== PAUSE TestAccAWSWafRateBasedRule_noPredicates
=== CONT  TestAccAWSWafRateBasedRule_noPredicates
--- PASS: TestAccAWSWafRateBasedRule_noPredicates (59.89s)
=== CONT  TestAccAWSWafRateBasedRule_changeNameForceNew
--- PASS: TestAccAWSWafRateBasedRule_disappears (81.40s)
--- PASS: TestAccAWSWafRateBasedRule_basic (109.11s)
--- PASS: TestAccAWSWafRateBasedRule_changePredicates (162.43s)
--- PASS: TestAccAWSWafRateBasedRule_changeNameForceNew (141.47s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	221.503s
...

[bflad]

Great implementation, thanks @DrFaust92 🚀

--- PASS: TestAccAWSWafRateBasedRule_noPredicates (13.60s)
--- PASS: TestAccAWSWafRateBasedRule_disappears (35.97s)
--- PASS: TestAccAWSWafRateBasedRule_changePredicates (48.42s)
--- PASS: TestAccAWSWafRateBasedRule_basic (78.73s)
--- PASS: TestAccAWSWafRateBasedRule_changeNameForceNew (88.31s)

[ghost]

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