Update security estimator and adds multi grinding security estimator#405

Al-Kindi-0 wants to merge 4 commits intofacebook:mainfacebook/winterfell:mainfrom

Al-Kindi-0:al-add-multi-grinding-security-estimatorAl-Kindi-0/winterfell:al-add-multi-grinding-security-estimatorCopy head branch name to clipboard