`string` constructor for the `CreateContainerParameters` or `Config` classes

It would be nice to have a string constructor for `Docker.DotNet.Models.CreateContainerParameters` or `Docker.DotNet.Models.Config` that would allow you to provide a valid [Docker API JSON string](https://docs.docker.com/engine/api/v1.25/#operation/ContainerCreate) to construct either the `CreateContainerParameters` or `Config` objects.

Currently, I have to take such a string, validate it and use it to construct the `Config` class. Then I take the newly minted `Config` object and use it to construct the `CreateContainerParameters` class.

This scenario seems like a common enough use case, and having a string constructor would greatly simply/standardize your user's workflow.