[WIP] Replace Spec classes with Pydantic models #1331
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Replaces #1273.
Start work on replacing docval with Pydantic (#1129) with the Spec classes, where are at the bottom of the stack and have relatively few interdependencies.
Working through this exercise highlights what we need to start deprecating/changing in the current API to migrate toward using Pydantic internally.
Checklist
CHANGELOG.md
with your changes?