[ast] Store managed names for fields and properties.

binder/Generators/AstGenerator.cs

@@ -669,6 +669,8 @@ namespace Embeddinator.Generators
             var accessMask = (fieldInfo.Attributes & FieldAttributes.FieldAccessMask);
             field.Access = ConvertFieldAttributesToAccessSpecifier(accessMask);
 
+            ManagedNames[field] = $"{fieldInfo.DeclaringType.FullName}:{fieldInfo.Name}";
+
             return field;
         }
 
@@ -701,6 +703,8 @@ namespace Embeddinator.Generators
                 property.SetMethod.Namespace = property.Namespace;
             }
 
+            ManagedNames[property] = $"{propertyInfo.DeclaringType.FullName}:{propertyInfo.Name}";
+
             return property;
         }
     }