Load.py SQL insertion performance enhancement

[shawngu39]

First thank you so much for creating this amazing repo!

While using the Load.py, I noticed that the data is generally inserted row-by-row, which could be really slow for some of the bigger tables (although they are not that big after all). I am using a low-tier AWS RDS instance with MySQL engine, and it is taking hours to insert certain tables, such as invNames, etc.. I put together some local quick modifications to switch to the bulk insertion from sqlalchemy lib and it speeds up things tremendously, from hours down to a few seconds for the invNames table as an example. Just want to bring this up and see how interested people are with this enhancement. If people believe this is a very useful enhancement, I can clean up my temp walkaround solution and turn it into a more prod quality change. Please let me know. Thanks!