This function returns open, high, low, close, and adjusted close prices as well as volume.
For a few stocks yahoo finance will return nothing for specific timestamps in the price series.
For performance reasons and easier integration with TimeSeries.jl these nothing values are returned as NaNs. Some other packages like python's yahooquery do not return these datapoints at all. We decided to return them to indicate a break in the series and to indicate that Yahoo Finance thinks it should have price information for the specific timestamp but does not have any.
get_prices