Fixed parameter bind bug (#38)

* Add components project of SkyWalking.Diagnostics.EntityFrameworkCore for supports EntityFrameworkCore diagnostics.

* Add builder extensions file and EF diagnostics default impl file.

* Add EntityFrameworkDiagnostic processor.

* Add unit tests for EntityFrameworkCore diagnostics component.

* Fixed parameter bind bug.

src/SkyWalking.Diagnostics.EntityFrameworkCore/EntityFrameworkCoreDiagnosticProcessor.cs

@@ -66,7 +66,7 @@ namespace SkyWalking.Diagnostics.EntityFrameworkCore
         }
 
         [DiagnosticName("Microsoft.EntityFrameworkCore.Database.Command.CommandError")]
-        public void CommandError(CommandErrorEventData eventData)
+        public void CommandError([Object]CommandErrorEventData eventData)
         {
             var span = ContextManager.ActiveSpan;
             if (span == null)