[v14.x] http2: use and support non-empty DATA frame with END_STREAM flag #34838
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Adds support for reading from a stream where the final frame is a
non-empty DATA frame with the END_STREAM flag set, instead of hanging
waiting for another frame. When writing to a stream, uses a
END_STREAM flag on final DATA frame instead of adding an empty
DATA frame.
BREAKING: http2 client now expects servers to properly support
END_STREAM flag
Fixes: #31309
Fixes: #33891
Refs: https://nghttp2.org/documentation/types.html#c.nghttp2_on_data_chunk_recv_callback
Checklist
make -j4 test
(UNIX), orvcbuild test
(Windows) passes