Support java streams on ndjson read and write

[nmaguiar]

When using io.writeLineNDJSON and io.readLinesNDJSON the ndjson files can be unusually large so it's useful to use gzip streams, to do something like:

var is = io.readFileGzipStream("data.ndjson.gz")
io.readFilesNDJSON(is, r => sprint(r))
is.close()