Add option to preserve image tags in S3

[andreineacsu]

Hello,

This is a feature request to add an option to preserve image tags in S3. In my case there is some business logic related to S3 file tags and we need them kept.

Thanks, Andrei

[ysugimoto]

Refers to https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#putObject-property, Tagging or Metadata should be fine and it can declare at config.json