Create a lnd wrapper

[renepickhardt]

Currently there exists a bridge to c-lightning. It would make a lot of sense if the autopilot is also usable by lnd. Thus I would love to have someone have a look at: https://github.com/renepickhardt/lightning-network-autopilot/blob/master/c-lightning-autopilot.py and see how to transform this to the lnd API. in particular the dataformat of the network graph in lib_autopilot.py is the one that is exported from c-lightning. so there might be the necessity to do some data transformation