This replaces multiple (2 x entry count) small reads with a single read
stream containing the full central directory and eliminates many
intermediate Buffer allocations and copies in the process, which were
resulting in increased time spent reading entries.

This is a port of the old entry parsing code to a Transform stream (as
an ES6 class; available since Node 6.0.0). The central directory size is
read from the ZIP64 end of central directory record (if available) and
used to bound the size of the requested Readable stream.

lazyEntries: true is implemented by pausing the stream and reading
individual Entry objects as requested.