lnrpc: add auth_proof to graph APIs

Added flag include_auth_proof to DescribeGraph, GetNodeInfo, GetChanInfo
and the corresponding lncli commands. With the flag, these APIs add AuthProof
(signatures from the channel announcement) to the returned ChannelEdge.

This is useful to extract this data from the DB.

cmd/commands/commands.go

@@ -1987,6 +1987,11 @@ var describeGraphCommand = cli.Command{
 				"graph. Unannounced channels are both private channels, and " +
 				"public channels that are not yet announced to the network.",
 		},
+		cli.BoolFlag{
+			Name: "include_auth_proof",
+			Usage: "If set, will include announcements' " +
+				"signatures into ChannelEdge.",
+		},
 	},
 	Action: actionDecorator(describeGraph),
 }
@@ -1998,6 +2003,7 @@ func describeGraph(ctx *cli.Context) error {
 
 	req := &lnrpc.ChannelGraphRequest{
 		IncludeUnannounced: ctx.Bool("include_unannounced"),
+		IncludeAuthProof:   ctx.Bool("include_auth_proof"),
 	}
 
 	graph, err := client.DescribeGraph(ctxc, req)
@@ -2055,6 +2061,11 @@ var getChanInfoCommand = cli.Command{
 				"the chan_id param is set this param is " +
 				"ignored.",
 		},
+		cli.BoolFlag{
+			Name: "include_auth_proof",
+			Usage: "If set, will include announcements' " +
+				"signatures into ChannelEdge.",
+		},
 	},
 	Action: actionDecorator(getChanInfo),
 }
@@ -2088,8 +2099,9 @@ func getChanInfo(ctx *cli.Context) error {
 	}
 
 	req := &lnrpc.ChanInfoRequest{
-		ChanId:    chanID,
-		ChanPoint: chanPoint,
+		ChanId:           chanID,
+		ChanPoint:        chanPoint,
+		IncludeAuthProof: ctx.Bool("include_auth_proof"),
 	}
 
 	chanInfo, err := client.GetChanInfo(ctxc, req)
@@ -2118,6 +2130,12 @@ var getNodeInfoCommand = cli.Command{
 			Usage: "if true, will return all known channels " +
 				"associated with the node",
 		},
+		cli.BoolFlag{
+			Name: "include_auth_proof",
+			Usage: "If set, will include announcements' " +
+				"signatures into ChannelEdge. Depends on " +
+				"include_channels",
+		},
 	},
 	Action: actionDecorator(getNodeInfo),
 }
@@ -2140,8 +2158,9 @@ func getNodeInfo(ctx *cli.Context) error {
 	}
 
 	req := &lnrpc.NodeInfoRequest{
-		PubKey:          pubKey,
-		IncludeChannels: ctx.Bool("include_channels"),
+		PubKey:           pubKey,
+		IncludeChannels:  ctx.Bool("include_channels"),
+		IncludeAuthProof: ctx.Bool("include_auth_proof"),
 	}
 
 	nodeInfo, err := client.GetNodeInfo(ctxc, req)