feat(gamelift): add BuildFleet L2 Construct for GameLift

[stevehouel]

Following aws/aws-cdk-rfcs#436 I have written the Gamelift BuildFleet L2 resource which create a Fleet resource.

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[gitpod-io]

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 13e30c4
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).