Add Tag Support to API Gateway API Key Resource

[DrFaust92]

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Relates #8744

Release note for CHANGELOG:

- resource/resource_aws_api_gateway_api_key: Add `tags` argument.

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSAPIGatewayApiKey_'

=== RUN   TestAccAWSAPIGatewayApiKey_basic
=== PAUSE TestAccAWSAPIGatewayApiKey_basic
=== CONT  TestAccAWSAPIGatewayApiKey_basic
--- PASS: TestAccAWSAPIGatewayApiKey_basic (29.75s)
=== RUN   TestAccAWSAPIGatewayApiKey_Tags
=== PAUSE TestAccAWSAPIGatewayApiKey_Tags
=== CONT  TestAccAWSAPIGatewayApiKey_Tags
--- PASS: TestAccAWSAPIGatewayApiKey_Tags (67.64s)
=== RUN   TestAccAWSAPIGatewayApiKey_Description
=== PAUSE TestAccAWSAPIGatewayApiKey_Description
=== CONT  TestAccAWSAPIGatewayApiKey_Description
--- PASS: TestAccAWSAPIGatewayApiKey_Description (47.29s)
=== RUN   TestAccAWSAPIGatewayApiKey_Enabled
=== PAUSE TestAccAWSAPIGatewayApiKey_Enabled
=== CONT  TestAccAWSAPIGatewayApiKey_Enabled
--- PASS: TestAccAWSAPIGatewayApiKey_Enabled (48.31s)
=== RUN   TestAccAWSAPIGatewayApiKey_Value
=== PAUSE TestAccAWSAPIGatewayApiKey_Value
=== CONT  TestAccAWSAPIGatewayApiKey_Value
--- PASS: TestAccAWSAPIGatewayApiKey_Value (29.49s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	106.370s

...

[bflad]

LGTM, thanks @DrFaust92 🚀

--- PASS: TestAccAWSAPIGatewayApiKey_Value (8.40s)
--- PASS: TestAccAWSAPIGatewayApiKey_basic (8.70s)
--- PASS: TestAccAWSAPIGatewayApiKey_Enabled (13.28s)
--- PASS: TestAccAWSAPIGatewayApiKey_Description (13.78s)
--- PASS: TestAccAWSAPIGatewayApiKey_Tags (18.67s)

[ghost]

This has been released in version 2.35.0 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!