too many code duplications
too many code duplications

reuse existing GetCsvFileStream for streaming file data

JKarathiya/Lean,QuantConnect/Lean,JKarathiya/Lean,QuantConnect/Lean,QuantConnect/Lean,StefanoRaggi/Lean,AlexCatarino/Lean,AlexCatarino/Lean,AlexCatarino/Lean,jameschch/Lean,StefanoRaggi/Lean,StefanoRaggi/Lean,jameschch/Lean,jameschch/Lean,JKarathiya/Lean,jameschch/Lean,StefanoRaggi/Lean,StefanoRaggi/Lean,jameschch/Lean,JKarathiya/Lean,AlexCatarino/Lean,QuantConnect/Lean