Propagate content length from filesystem through geny.Writable and os.Source
#320
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This means downstream libraries like Requests-Scala or Cask can properly set the content length when handling
os.read.streams and similar values in their HTTP requests or responsesNoticed the lack of this when uploading to github failed in com-lihaoyi/mill#3686 due to the lack of content length header in the upload
Covered by unit tests