Update structure types to record structs (#326)

Raylib-cs/types/Rectangle.cs

@@ -7,7 +7,7 @@ namespace Raylib_cs;
 /// Rectangle type
 /// </summary>
 [StructLayout(LayoutKind.Sequential)]
-public struct Rectangle
+public record struct Rectangle
 {
     public float X;
     public float Y;
@@ -106,9 +106,4 @@ public struct Rectangle
         Width -= shrink * 2.0f;
         Height -= shrink * 2.0f;
     }
-
-    public readonly override string ToString()
-    {
-        return $"{{X:{X} Y:{Y} Width:{Width} Height:{Height}}}";
-    }
 }