removes CompressedStorageAttribute, makes IPropertyCacheCompressionOptions which can be defined in DI to configure what properties can be compressed in memory and new IReadOnlyContentBase to provide some context to the IPropertyCacheCompressionOptions

src/Umbraco.Core/PropertyEditors/IPropertyCacheCompression.cs

@@ -0,0 +1,15 @@
+using Umbraco.Core.Models;
+
+namespace Umbraco.Core.PropertyEditors
+{
+    /// <summary>
+    /// Determines if a property type's value should be compressed in memory
+    /// </summary>
+    /// <remarks>
+    /// 
+    /// </remarks>
+    public interface IPropertyCacheCompression
+    {        
+        bool IsCompressed(IReadOnlyContentBase content, string propertyTypeAlias);
+    }
+}