[LifeSci] Move to Independent Repo (#1592)

* Move LifeSci

* Remove doc

apps/life_sci/python/dgllife/libinfo.py

-"""Information for the library."""
-
-# current version
-__version__ = '0.2.2'

apps/life_sci/python/dgllife/model/__init__.py

-"""Model architectures and components at different levels."""
-from .gnn import *
-from .readout import *
-from .model_zoo import *
-from .pretrain import *

apps/life_sci/python/dgllife/model/gnn/__init__.py

-"""Graph neural networks for updating node representations."""
-from .attentivefp import *
-from .gat import *
-from .gcn import *
-from .mgcn import *
-from .mpnn import *
-from .schnet import *
-from .wln import *
-from .weave import *
-from .gin import *