IoT Authorizer HTTP caching support

[tmarlok88]

Adds support for HTTP caching on an IoT authorizer.

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Output from acceptance testing:

$ AWS_PROFILE=default make testacc TESTARGS='-run=TestAccIoTAuthorizer_basic' PKG_NAME=internal/service/iot
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/iot/... -v -count 1 -parallel 20  -run=TestAccIoTAuthorizer_basic -timeout 180m
=== RUN   TestAccIoTAuthorizer_basic
=== PAUSE TestAccIoTAuthorizer_basic
=== CONT  TestAccIoTAuthorizer_basic
--- PASS: TestAccIoTAuthorizer_basic (55.23s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/iot	55.317s

...

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccIoTAuthorizer_ PKG=iot ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/iot/... -v -count 1 -parallel 2 -run='TestAccIoTAuthorizer_'  -timeout 180m
=== RUN   TestAccIoTAuthorizer_basic
=== PAUSE TestAccIoTAuthorizer_basic
=== RUN   TestAccIoTAuthorizer_disappears
=== PAUSE TestAccIoTAuthorizer_disappears
=== RUN   TestAccIoTAuthorizer_signingDisabled
=== PAUSE TestAccIoTAuthorizer_signingDisabled
=== RUN   TestAccIoTAuthorizer_update
=== PAUSE TestAccIoTAuthorizer_update
=== CONT  TestAccIoTAuthorizer_basic
=== CONT  TestAccIoTAuthorizer_signingDisabled
--- PASS: TestAccIoTAuthorizer_signingDisabled (42.16s)
=== CONT  TestAccIoTAuthorizer_disappears
--- PASS: TestAccIoTAuthorizer_basic (47.45s)
=== CONT  TestAccIoTAuthorizer_update
--- PASS: TestAccIoTAuthorizer_disappears (29.18s)
--- PASS: TestAccIoTAuthorizer_update (42.91s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/iot	94.099s

[ewbankkit]

@tmarlok88 Thanks for the contribution 🎉 👏.
I renamed the new argument to enable_caching_for_http to match the underlying AWS API field.

[github-actions]

This functionality has been released in v4.9.0 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.