IObjectSerializerFactory stores all serializers as singleton

Description

IObjectSerializerFactory that creates serializers for IObjectSerializer registered in container caches those instances in a singleton instance instead using each serializers lifecycle.

After fixing IObjectSerializerFactory, this scenario should work:

Steps to reproduce
1. Go to Admin mode > Select any page type (e.g., Standard page).
2. Add a property to the page type.
3. Edit the property: 'Value must be entered' is checked, 'Tab': "Content" > Save data
(NOTE: You must do step 3 to reproduce bug. You cannot reproduce the bug if not editing a value.)
4. Go to Edit View.
5. Create a new page with the page type.

Expected: The page is created successfully.
Actual: Cannot create a page. It is hung when clicking the 'Create' button.