The recursive `read-items` function in `app.util.sse/read-stream`
caused a synchronous stack overflow when reading buffered stream
data. Each `rx/mapcat` call chained another recursive invocation
on the same call stack without yielding to the event loop.
Replace the recursive pattern with an `rx/create`-based async pump
that uses Promise `.then()` chaining, keeping the call stack depth
constant regardless of stream size.
Also add progress reporting with names and IDs during binfile
export and import, and bump `eventsource-parser` dependency.
Closes#9470
Signed-off-by: Andrey Antukh <niwi@niwi.nz>
ec0d692856