multi: allow specifying max csv for locally initiated channels

lnrpc/rpc.proto

@@ -1750,6 +1750,12 @@ message OpenChannelRequest {
     to the commitment transaction.
     */
     uint32 remote_max_htlcs = 16;
+
+    /*
+    Max local csv is the maximum csv delay we will allow for our own commitment
+    transaction.
+    */
+    uint32 max_local_csv = 17;
 }
 message OpenStatusUpdate {
     oneof update {

lnrpc/rpc.swagger.json

@@ -4617,6 +4617,11 @@
           "type": "integer",
           "format": "int64",
           "description": "The maximum number of concurrent HTLCs we will allow the remote party to add\nto the commitment transaction."
+        },
+        "max_local_csv": {
+          "type": "integer",
+          "format": "int64",
+          "description": "Max local csv is the maximum csv delay we will allow for our own commitment\ntransaction."
         }
       }
     },