Get past race contentSource:
Returns a list of a race or many races data including runners, markets, dividends and pools
Can either use this function and provide it the race API URL, or use
to get the same results. Note this can return results for many race meets.
Can then use the parsing functions to get the data you want from these lists.
race meet date in 'YYYY-MM-DD' format
the mnemonic of the track
the type of race, either R, H, G
integer if the race number. If null, then all races for meet(s) returned