Read storage as byte if passed, for Unity Texture (#34)

* Read storage as byte if passed, for Unity Texture

* Update Thirdweb.Storage.Tests.cs

Thirdweb.Tests/Thirdweb.Storage.Tests.cs

@@ -46,6 +46,15 @@ public async Task DownloadTest_ThirdwebIPFS()
         Assert.NotNull(res);
     }
 
+    [Fact]
+    public async Task DownloadTest_Bytes()
+    {
+        var client = ThirdwebClient.Create(secretKey: _secretKey);
+        var res = await ThirdwebStorage.Download<byte[]>(client, "https://1.rpc.thirdweb.com/providers");
+        Assert.NotNull(res);
+        Assert.NotEmpty(res);
+    }
+
     [Fact]
     public async Task DownloadTest_400()
     {

Thirdweb/Thirdweb.Storage/ThirdwebStorage.cs

@@ -24,9 +24,19 @@ public static async Task<T> Download<T>(ThirdwebClient client, string uri, int?
                 throw new Exception($"Failed to download {uri}: {response.StatusCode} | {await response.Content.ReadAsStringAsync()}");
             }
 
-            var content = await response.Content.ReadAsStringAsync();
-
-            return typeof(T) == typeof(string) ? (T)(object)content : JsonConvert.DeserializeObject<T>(content);
+            if (typeof(T) == typeof(byte[]))
+            {
+                return (T)(object)await response.Content.ReadAsByteArrayAsync();
+            }
+            else if (typeof(T) == typeof(string))
+            {
+                return (T)(object)await response.Content.ReadAsStringAsync();
+            }
+            else
+            {
+                var content = await response.Content.ReadAsByteArrayAsync();
+                return JsonConvert.DeserializeObject<T>(System.Text.Encoding.UTF8.GetString(content));
+            }
         }
 
         public static async Task<IPFSUploadResult> Upload(ThirdwebClient client, string path)