Download multiple media files for each occurrence on GBIF

[LevanBokeria]

Currently, the 02-fetch_gbif_moth_data_serial.py downloads the first media file associated with an occurrence of an individual moth. Sometimes, the media dataframe contains multiple images per occurrence, taken from different angles.

Considering downloading all the media files. Will have to come up with a new way of naming the downloaded images, since currently they are named with their occurrence ID.

Should also ask Aditja and Fagner is there is a reason for ignoring the multiple media entries.