Changes to Create a Multi FileFeed

removed DestinationSftp DestinationS3 from the destination request property anyOf list

removed SourceSftp SourceS3 from the source request property anyOf list

removed the request property post_validation_transform_key

removed the optional property post_validation_transform_key from the response with the 200 status

added the new optional request property destinations

added the new optional request property sources

added DestinationConnection to the destination request property anyOf list

added SourceConnection to the source request property anyOf list

added the optional property destinations to the response with the 200 status

added the optional property sources to the response with the 200 status