test: add integration tests for invoice settle/add notifications
test: add integration tests for invoice settle/add notifications

ddustin/lnd,aakselrod/lnd,aakselrod/lnd,bryanvu/lnd,LightningNetwork/lnd,AndrewSamokhvalov/lnd,LightningNetwork/lnd,AndrewSamokhvalov/lnd,ddustin/lnd,bryanvu/lnd