feat(gamelift): add Alias L2 Construct for GameLift

[stevehouel]

Following aws/aws-cdk-rfcs#436 I have written the Gamelift Alias L2 resource which create an Alias resource. Adding related method to FleetBase class to simplify integration.

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[gitpod-io]

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: e334cb3
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