Refactor for .NET framework compatibility

Added preprocessor directives to conditionally include
code for different .NET frameworks. Adjusted namespace
declarations and organized the `Static` class for
improved clarity and maintainability.

DigitalData.Core.Abstraction.Application/StaticProvider.cs

@@ -5,7 +5,7 @@ using System;
 using DigitalData.Core.Abstraction.Application.Repository;
 using Microsoft.Extensions.DependencyInjection;
 
-namespace DigitalData.Core.Infrastructure
+namespace DigitalData.Core.Abstraction.Application
 #if NET
     ;
 #elif NETFRAMEWORK