Greenfield: Add balance endpoint (#3887)

* Greenfield: Add balance endpoint

* Remove superfluous try/catch

BTCPayServer.Client/Models/LightningNodeBalanceData.cs

@@ -0,0 +1,52 @@
+using BTCPayServer.Client.JsonConverters;
+using BTCPayServer.Lightning;
+using Newtonsoft.Json;
+
+namespace BTCPayServer.Client.Models
+{
+    public class LightningNodeBalanceData
+    {
+        [JsonProperty("onchain")]
+        public OnchainBalanceData OnchainBalance { get; set; }
+        
+        [JsonProperty("offchain")]
+        public OffchainBalanceData OffchainBalance { get; set; }
+        
+        public LightningNodeBalanceData()
+        {
+        }
+
+        public LightningNodeBalanceData(OnchainBalanceData onchain, OffchainBalanceData offchain)
+        {
+            OnchainBalance = onchain;
+            OffchainBalance = offchain;
+        }
+    }
+
+    public class OnchainBalanceData
+    {
+        [JsonConverter(typeof(LightMoneyJsonConverter))]
+        public LightMoney Confirmed { get; set; }
+        
+        [JsonConverter(typeof(LightMoneyJsonConverter))]
+        public LightMoney Unconfirmed { get; set; }
+        
+        [JsonConverter(typeof(LightMoneyJsonConverter))]
+        public LightMoney Reserved { get; set; }
+    }
+
+    public class OffchainBalanceData
+    {
+        [JsonConverter(typeof(LightMoneyJsonConverter))]
+        public LightMoney Opening { get; set; }
+        
+        [JsonConverter(typeof(LightMoneyJsonConverter))]
+        public LightMoney Local { get; set; }
+        
+        [JsonConverter(typeof(LightMoneyJsonConverter))]
+        public LightMoney Remote { get; set; }
+        
+        [JsonConverter(typeof(LightMoneyJsonConverter))]
+        public LightMoney Closing { get; set; }
+    }
+}