Fix CanonicalObjectSchemaProperty types (#4652)
Fix CanonicalObjectSchemaProperty types (#4652)

This fixes the typescript types to correctly represent the optionality of property schemas `objectType`.
realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js