Read a sequence of entries asynchronously, allowing to read after the LastAddConfirmed range.
This is the same of
#read(long,long)but it lets the client read without checking the local value of LastAddConfirmed, so that it is possibile to
read entries for which the writer has not received the acknowledge yet.
For entries which are within the range 0..LastAddConfirmed BookKeeper guarantees that the writer has successfully
received the acknowledge.
For entries outside that range it is possible that the writer never received the acknowledge
and so there is the risk that the reader is seeing entries before the writer and this could
result in a consistency issue in some cases.
With this method you can even read entries before the LastAddConfirmed and entries after it with one call,
the expected consistency will be as described above for each subrange of ids.