#3313 Ability to configure fetch batch size when using FetchGroups and query beans

[rbygrave]

We can do this currently using string paths and properties, this adds support for doing this when using query beans and strong types

  private static final FetchGroup<Customer> FETCHGROUP_CustomerWithContacts = QCustomer.forFetchGroup()
    .select(cu.name, cu.phoneNumber)
    .contacts.fetch(FetchConfig.ofQuery(1000), co.firstName, co.lastName, co.email)
    .buildFetchGroup();


    new QCustomer()
      .select(FETCHGROUP_CustomerWithContacts)
      .findList();