Content-Encoding for PutS3Object and FetchS3Object

Hi,

HTTP has content-encoding with gzip as a standard. See here: https://www.iana.org/assignments/http-parameters/http-parameters.xhtml

By using AWS S3 or other S3 compliant storages users compress the content to be uploaded with gzip and set the HTTP Header Content-Encodig: gzip and the mime.type accordingly. 

The PutS3Object processor does not have an attribute to set the Content-Encoding header. User defined properties are put in generic HTTP Headers which do not help. 

My wish would be:

1. FetchS3Object:
   1. reads the content-encoding and decodes gzip into non gzip with an attribute: Evaluate Content-Encoding 
   2. FetchS3 should create s3 header attributes which are stored in the s3 object 
2. PutS3Object
   1. Has a Content-Encoding attribute where users can put "gzip" as a possible value
   2. Has an option to compress the flow file content in gzip with true|false. This would have a huge performance impact, because currently we need to compress the content, s3 upload and then decompress it afterwards 

Thank you in advance