[doc] Add an example showing a custom FilePartHandler #6202
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Fixes
Fixes #6182
Purpose
This code sample adds a snippet to ScalaFileUpload.md and uses code from https://github.com/wsargent/play-fileupload-scala to show how to use a custom FilePartHandler with Akka Streams.
Background Context
The page previously referenced an Iteratee and a PartHandler, and did not have an example.