CollectionContainer should have a sorter by default

[knstvk]

Environment

• Platform version: 7.0

Description of the bug or enhancement

Now if a CollectionContainer is not connected to a loader, it has no Sorter, which means a connected table is not sorted when user clicks on headers.

To reproduce, define an additional container in a screen, connect to a table and fill:

@Inject
private CollectionContainer<Customer> copyDc;
@Inject
private CollectionContainer<Customer> customersDc;

@Subscribe(id = "customersDc", target = Target.DATA_CONTAINER)
private void onCustomersDcCollectionChange(CollectionContainer.CollectionChangeEvent<Customer> event) {
    copyDc.setItems(customersDc.getItems());
}

// this is required to make sorting work
@Subscribe
private void onInit(InitEvent event) {
    copyDc.setSorter(new CollectionContainerSorter(copyDc, null));
}