Add ContractMultiplier setter to Cfd via CfdSymbolProperties#9328

JosueNina wants to merge 7 commits intoQuantConnect:masterQuantConnect/Lean:masterfrom

JosueNina:bug-9310-cfd-contract-multiplier-setterJosueNina/Lean:bug-9310-cfd-contract-multiplier-setterCopy head branch name to clipboard