add support for api type in appsync api

[ReeceXW]

Description

This adds support for the API type field in a aws_appsync_graphql_api resource

Relations

References

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-appsync-graphqlapi.html

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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[github-actions]

Welcome @ReeceXW 👋

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