Option for configuring existing cloudfront

Hello. Thanks for this sample. I believe this will create a new s3 bucket for hosting static files and also create a cloudfront distribution for serving those files/contents. Please let me know if I'm mistaken.

Could you please provide an option so that I can deploy the lambda that will connect to an existing cloudfront?

I already have cloudfront distribution serving from existing s3 bucket. I'd prefer to keep that infrastructure since they have other configs made. Giving the option for using existing cloudfront will also be useful if contents are served from an origin other than s3 bucket.

该 issue 未指定文件、测试或入口点。首先定位示例中用于 Lambda、S3 存储桶和 CloudFront 分发的部署配置；完成的标准是，某个选项可以指向现有的 CloudFront 分发，同时保留其现有的源设置。

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