routing+lnrpc: add inbound fee policy update

lnrpc/lightning.proto

@@ -4312,7 +4312,15 @@ message ChannelFeeReport {
     // The effective fee rate in milli-satoshis. Computed by dividing the
     // fee_per_mil value by 1 million.
     double fee_rate = 4;
+
+    // The base fee charged regardless of the number of milli-satoshis sent.
+    int32 inbound_base_fee_msat = 6;
+
+    // The amount charged per milli-satoshis transferred expressed in
+    // millionths of a satoshi.
+    int32 inbound_fee_per_mil = 7;
 }
+
 message FeeReportResponse {
     // An array of channel fee reports which describes the current fee schedule
     // for each channel.
@@ -4363,7 +4371,11 @@ message PolicyUpdateRequest {
 
     // If true, min_htlc_msat is applied.
     bool min_htlc_msat_specified = 8;
+
+    int32 inbound_base_fee_msat = 10;
+    int32 inbound_fee_rate_ppm = 11;
 }
+
 enum UpdateFailure {
     UPDATE_FAILURE_UNKNOWN = 0;
     UPDATE_FAILURE_PENDING = 1;