post https://api.humanloop.com/v4/model-configs
Register a model config to a project and optionally add it to an
experiment.
If the project name provided does not exist, a new project will be created
automatically.
If an experiment name is provided, the specified experiment must already
exist. Otherwise, an error will be raised.
If the model config is the first to be associated to the project, it will
be set as the active model config.