[WIP] Adopt pydantic-based PICMI standard

[chillenzer]

• This is WIP, based on my on-going refactoring of the PICMI standard to use pydantic. Point pyproject.toml to the first pydantic-based PICMI version once that is released.
• Rebase onto latest dev.

Pydantic-based PICMI

This PR starts the process of converging our PICMI implementation to the standard (and correspondingly the standard to our PICMI interface). It's foremost goal is to be a testbed for the changes in the PICMI standard (see here). However, as a side effect, there are quite adjustments to the interface and/or test coverage going on and a number of open issues addressed.

Pydantic-focused changes

The main changes happening here are

• inheriting from the PICMI standard (if that's not already happening), particularly from PICMI_Extension in cases that are PIConGPU specific
• overriding typehints and defaults: Narrowing down typehints is a convenient way to signal unsupported arguments/values/...
• adjusting some tests to assertRaises(ValidationError) instead of manually thrown errors and some minor interface changes.

Standard-convergence changes

Some minor to moderate steps to a more conformant implementation have been taken in the process:

• Our GriddedLayout now conforms to the standard (BREAKING CHANGE!) and I've added OnePosition as a new layout. There would be better names/interfaces for this but those would not be standard conforming. This will be addressed within the PICMI standard team later. I've also added tests for all supported layouts.
• Replace the binomial_current_interpolation switch with a standard-conformant BinomialSmoother class added to the ElectromagneticSolver.