HTTP/3: proper uni stream closure detection.

Previously, closure detection for server-initiated uni streams was not properly
implemented.  Instead, HTTP/3 code relied on QUIC code posting the read event
and setting rev->error when it needed to close the stream.  Then, regular
uni stream read handler called c->recv() and received error, which closed the
stream.  This was an ad-hoc solution.  If, for whatever reason, the read
handler was called earlier, c->recv() would return 0, which would also close
the stream.

Now server-initiated uni streams have a separate read event handler for
tracking stream closure.  The handler calls c->recv(), which normally returns
0, but may return error in case of closure.

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