feat(series): #1098 arithmetic addition#1275

Dr-Irv merged 10 commits intopandas-dev:mainpandas-dev/pandas-stubs:mainfrom

cmp0xff:feature/cmp0xff/1098-__add__-and-__mul__cmp0xff/pandas-stubs:feature/cmp0xff/1098-__add__-and-__mul__Copy head branch name to clipboard