Stop passing component initializers as hparams

Pass the component initializer as an hparam slows down the script very much. The
API has now been changed to pass it as a kwarg to the models instead.

The example scripts have also been updated to reflect the new changes.

Also, ImageGMLVQ and an example script `gmlvq_mnist.py` that uses it have also
been added.

prototorch/models/__init__.py

@@ -2,7 +2,7 @@ from importlib.metadata import PackageNotFoundError, version
 
 from .cbc import CBC
 from .glvq import (GLVQ, GMLVQ, GRLVQ, LVQ1, LVQ21, LVQMLN, ImageGLVQ,
-                   SiameseGLVQ)
+                   ImageGMLVQ, SiameseGLVQ)
 from .knn import KNN
 from .neural_gas import NeuralGas
 from .vis import *