feature: Support CORS config #46
Description
S3 buckets can have a CORS configuration as per https://docs.aws.amazon.com/AmazonS3/latest/userguide/cors.html
This configuration is set at bucket level and should be respected when accessing S3 resources. This should be the case for static hosting but also for requests like pre-signed URIs.
At this time there is only a very basic implementation for CORS. The hooks that have been put in place should however allow for a "real" implementation where the proxy fetches the CORS config. This would however likely require caching to be efficient.