drop pydantic<2.0 support #234
Description
After ~2 years, it might be time to drop pydantic<1 support. Right now, there are a lot of noisy warnings from supporting the older version.
In order to migrate, we'll need to update all the code for supplying examples from example to examples in JSON. The examples are also how we create prototypes, so we'll want to be careful maintaining the correct type as the examples go from a value to a set of values in a list.
related #231