get_recommendations_all: Get recommendations for a submitted vector of track IDs, with no limit on the number of seed tracks
Description
This is a wrapper for the get_recommendations function, which provides a workaround for
the limit of 5 seed tracks per recommendation call. The function splits a supplied vector
of track IDs into subsets of length 5, then applies a get_recommendations call,
5 tracks at a time. This should generate a data frame of recommended tracks, with
length equal to the supplied vector of track ids.