Create a db partition for each taxon

[jxa]

• Store taxon entity in partition
• Store sighting entities in same partition
• Results in significantly better query times

[jxa]

Unfortunately this partition scheme seems to have crushed the performance of the species/index. I think this is due to storing the taxon entities alongside their sightings (in the same partition). It should be relatively straightforward to move these into another partition just for taxons, which should restore performance and hopefully not kill the gains from this PR. Please be kind to the environment and refrain from importing until I have fixed the partition scheme