Add the `DICTIONARY_AUTHOR` loop

[vaitkus]

The DICTIONARY_AUTHOR loop records dictionary authors in a more structures way by including their names, emails and ORCIDs.

This list should probably include both the main developers of the DDLm version and the developers of the original DDL1 version (see _dictionary_history in [1]). Also, we should probably get the approval of these people if we plan to include their emails addresses (or these fields could be left as inapplicable ".")

[1] https://github.com/COMCIFS/DDL1-legacy-dictionaries/blob/main/dictionaries/cif_pd.dic