Add project files.

BlazorDeviceInterop.Components/JsRuntimeObjectRef.cs

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+using Microsoft.JSInterop;
+using System;
+using System.Text.Json.Serialization;
+using System.Threading.Tasks;
+
+namespace BlazorDeviceInterop.Components
+{
+    public class JsRuntimeObjectRef : IAsyncDisposable
+    {
+        internal IJSRuntime JSRuntime { get; set; }
+
+        [JsonPropertyName("__jsObjRefId")]
+        public int JsObjectRefId { get; set; }
+
+        public async ValueTask DisposeAsync()
+        {
+            await JSRuntime.InvokeVoidAsync("deviceInterop.removeObjectRef", JsObjectRefId);
+        }
+    }
+}