lnrpc: add filters to forwardhistoryrequest

This commit adds incoming and outgoing channel ids filter to forwarding history request to filter events received/forwarded from/to a particular channel

lnrpc/lightning.proto

@@ -4671,6 +4671,14 @@ message ForwardingHistoryRequest {
     // Informs the server if the peer alias should be looked up for each
     // forwarding event.
     bool peer_alias_lookup = 5;
+
+    // List of incoming channel ids to filter htlcs received from a
+    // particular channel
+    repeated uint64 incoming_chan_ids = 6;
+
+    // List of outgoing channel ids to filter htlcs being forwarded to a
+    // particular channel
+    repeated uint64 outgoing_chan_ids = 7;
 }
 message ForwardingEvent {
     // Timestamp is the time (unix epoch offset) that this circuit was

lnrpc/lightning.swagger.json

@@ -5114,6 +5114,22 @@
         "peer_alias_lookup": {
           "type": "boolean",
           "description": "Informs the server if the peer alias should be looked up for each\nforwarding event."
+        },
+        "incoming_chan_ids": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "format": "uint64"
+          },
+          "title": "List of incoming channel ids to filter htlcs received from a\nparticular channel"
+        },
+        "outgoing_chan_ids": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "format": "uint64"
+          },
+          "title": "List of outgoing channel ids to filter htlcs being forwarded to a\nparticular channel"
         }
       }
     },