Instantiate models with keyword arguments now, no longer via "params" dictionary; although API still uses this name when passing Pydantic parameters models.  API describes model via its info property now, which passes instance property, not its init arguments.

Renamed some model classes; expanded scope of trivial object classification model to be functional base on intensity threshold, too

Make requirements.yml match pyproject.toml, namely rolling back ilastik build and pinning protobuf, which causes issues in ilastik 1.4.1b15

Tests parameterize models directly with dicts, not pydantic models, which are reserved for API calls

Incomplete, but replacing manual status code assertions with assertion methods of TestServerBaseClass

Removed model_id from Model objects, which in any case in managed by session.  But tests aren't passing; need to investigate further.

Dummy models in conf.testing

See merge request rhodes/model_server!66