Add Option.IsOptionChain and Option.IsOptionContract flags
Add Option.IsOptionChain and Option.IsOptionContract flags

These flags allow algorithms to test an option security object to see if it
represents an actual options contract or the entire option chain.

AlexCatarino/Lean,StefanoRaggi/Lean,AnshulYADAV007/Lean,JKarathiya/Lean,StefanoRaggi/Lean,jameschch/Lean,Jay-Jay-D/LeanSTP,QuantConnect/Lean,JKarathiya/Lean,AnshulYADAV007/Lean,kaffeebrauer/Lean,QuantConnect/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,kaffeebrauer/Lean,AlexCatarino/Lean,Jay-Jay-D/LeanSTP,Jay-Jay-D/LeanSTP,AnshulYADAV007/Lean,JKarathiya/Lean,AnshulYADAV007/Lean,StefanoRaggi/Lean,Jay-Jay-D/LeanSTP,AlexCatarino/Lean,kaffeebrauer/Lean,jameschch/Lean,AlexCatarino/Lean,jameschch/Lean,JKarathiya/Lean,QuantConnect/Lean,jameschch/Lean,StefanoRaggi/Lean,Jay-Jay-D/LeanSTP,AnshulYADAV007/Lean,jameschch/Lean,QuantConnect/Lean,kaffeebrauer/Lean