feat(h2): implement flow control for h2 bodies #1558
Merged
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This is implemented sligntly differently than what the TODO comment
said, but matches with tower-h2's implementation. h2 already handles the
buffering of the pending chunk and capacity management for it, so we
just want to make sure there's some capacity available (i.e. the
previous chunk has been fully written out).
Closes #1548