[feat]: ultimate normalization script

[ShaunSHamilton]

Going forward, there are likely many times we may want to normalize records. As such, we need a smart script:

Musts

• not bring down production to run script
  • it should be a script we can tune to not hammer the db, and quietly run in the background
• easy to define/add transformations
• fault tolerant
• keep track of versioning
  • must not repeat work - the script should be stopped/started without hesitation, and start off where it left off
• fearlessly concurrent
  • the api will write a lastUpdated field to the user record which should allow all ops to be done without losing data

Niceties

• dynamically asks database how loaded it is, and accordingly adjusts ops/rps

Notes

Currently, the idea is to add a schemaVersion field to the user record.

I would prefer to write this in Rust:

1. Ease of distribution
2. Strict typing

That said, this might go against "easy to define/add transformations".