Enhancement: Add benchmark(s)

[iron3oxide]

Even though performance isn't the main argument for using ormdantic, one might want to know how it fares in a typical scenario compared to other ORMs, e.g. sqlmodel, PonyORM, sqlalchemy etc. If the example app (see #39) is designed well, it could double as a benchmark app, meaning there is a slightly modified version in the repo (or another, designated benchmark repo) for each ORM.

[yezz123]

I'm planning to add benchmarks ASAP I start with this repo to set up and test several functions that ormdantic provides ex. create, update, delete, etc...

https://github.com/yezz123/TodoList-Ormdantic-starter