Add newer/additional Kraken DBs for DQT/taxasaurus rex

[mtisza1]

A colleague from the SV Hackathon 2022 shared a link with me to the updated kraken 2 databases, possible useful for the DQT/taxasaurus rex tool:
kraken2 indices

I don't have the context to know if adding these to the list of indexed DBs is feasible or useful, but I wanted the lead developers to be aware of them.

Mike

[kternus]

Very cool, thanks for sharing @mtisza1!