Revert "Remove C# 10 feature codes."

This reverts commit f7ae6d2.

samples/dotnetCampus.LargeAddressAware.Sample/Program.cs

@@ -1,12 +1,11 @@
 using System;
 
-namespace dotnetCampus.LargeAddressAware.Sample
+namespace dotnetCampus.LargeAddressAware.Sample;
+
+internal class Program
 {
-    internal class Program
+    static void Main(string[] args)
     {
-        static void Main(string[] args)
-        {
-            Console.WriteLine("Hello World!");
-        }
+        Console.WriteLine("Hello World!");
     }
 }

src/dotnetCampus.LargeAddressAware/Program.cs

@@ -1,10 +1,8 @@
-namespace dotnetCampus.LargeAddressAware
+namespace dotnetCampus.LargeAddressAware;
+
+internal static class Program
 {
-    internal static class Program
+    private static void Main()
     {
-        private static void Main()
-        {
-
-        }
     }
 }

src/dotnetCampus.LargeAddressAware/Properties/Global.cs

@@ -0,0 +1,3 @@
+global using System;
+global using System.Collections.Generic;
+global using System.Text;