# Functions
New creates a new BalancerGroup.
ParseConfig parses a child config list and returns a LB config for the gracefulswitch Balancer.
# Structs
BalancerGroup takes a list of balancers, each behind a gracefulswitch balancer, and make them into one balancer.
Options wraps the arguments to be passed to the BalancerGroup ctor.
# Interfaces
BalancerStateAggregator aggregates sub-picker and connectivity states into a state.