lnrpc+rpcserver: add new fully resolved chan update event

This commit adds the new channel update event for a channel that is now
fully resolved to the event subscription RPC.

lnrpc/lightning.proto

@@ -2249,6 +2249,7 @@ message ChannelEventUpdate {
         ChannelPoint active_channel = 3;
         ChannelPoint inactive_channel = 4;
         PendingUpdate pending_open_channel = 6;
+        ChannelPoint fully_resolved_channel = 7;
     }
 
     enum UpdateType {
@@ -2257,6 +2258,7 @@ message ChannelEventUpdate {
         ACTIVE_CHANNEL = 2;
         INACTIVE_CHANNEL = 3;
         PENDING_OPEN_CHANNEL = 4;
+        FULLY_RESOLVED_CHANNEL = 5;
     }
 
     UpdateType type = 5;

lnrpc/lightning.swagger.json

@@ -2327,7 +2327,8 @@
         "CLOSED_CHANNEL",
         "ACTIVE_CHANNEL",
         "INACTIVE_CHANNEL",
-        "PENDING_OPEN_CHANNEL"
+        "PENDING_OPEN_CHANNEL",
+        "FULLY_RESOLVED_CHANNEL"
       ],
       "default": "OPEN_CHANNEL"
     },
@@ -3306,6 +3307,9 @@
         "pending_open_channel": {
           "$ref": "#/definitions/lnrpcPendingUpdate"
         },
+        "fully_resolved_channel": {
+          "$ref": "#/definitions/lnrpcChannelPoint"
+        },
         "type": {
           "$ref": "#/definitions/ChannelEventUpdateUpdateType"
         }