RegistryMixin - tooling for easier registry/plugin patterns across NM repos

[bfineran]

proposes a structure that can be used as a universal registry for NM parent classes that follow a registry pattern or future plugins

Classes or factories that require a registry can add RegistryMixin as a parent class to get access to the functionality. The included classmethods should work for each class that contains the mixin separately.

Supports either loading values either from the registered names or a file:name pattern for custom file impelementations.

brief example from doc

class Dataset(RegistryMixin):
    pass


# register with default name
@Dataset.register()
class ImageNetDataset(Dataset):
    pass

# load as "ImageNetDataset"
imagenet = Dataset.load("ImageNetDataset")

# register with custom name
@Dataset.register(name="cifar-dataset")
class Cifar(Dataset):
    pass

# load as "cifar-dataset"
cifar = Dataset.load_from_registry("cifar-dataset")

# load from custom file that implements a dataset
mnist = Dataset.load_from_registry("/path/to/mnnist_dataset.py:MnistDataset")

test_plan:
simple unit tests included

stale