These signals allow monitoring where in the HTTP1/HTTP2
flow a request is currently in.
Fixes: QTBUG-71698
Fixes: QTBUG-18766
Change-Id: Icc2fe435afc9f680fa7a76c32731e25fcdfeb4b4
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>