add ability to fetch any contract's balance

Author: joaquim-verges

Assets/Thirdweb/Scripts/Contract.cs

@@ -38,6 +38,11 @@ public Contract(string chain, string address, string abi = null) : base(abi != n
             this.marketplace = new Marketplace(chain, address);
         }
 
+        public async Task<CurrencyValue> GetBalance()
+        {
+            return await Bridge.InvokeRoute<CurrencyValue>($"sdk{separator}getBalance", Utils.ToJsonStringArray(address));
+        }
+
         /// <summary>
         /// Read data from a contract
         /// </summary>

Assets/WebGLTemplates/Thirdweb/lib/thirdweb.js

@@ -85,6 +85,9 @@ w.bridge.invoke = async (route, payload) => {
     if (prop && routeArgs.length === 2) {
       const result = await w.thirdweb[prop][routeArgs[1]](...parsedArgs);
       return JSON.stringify({ result: result }, bigNumberReplacer);
+    } else if (routeArgs.length === 2) {
+      const result = await w.thirdweb[routeArgs[1]](...parsedArgs);
+      return JSON.stringify({ result: result }, bigNumberReplacer);
     } else {
       throw "Invalid Route";
     }