Especially useful for clients who don't use the PUSH_PROMISE functionality and don't require buffering the data. We add the QHttp2Stream::Configuration struct to allow customizing stream behavior. Every stream comes with a configuration and the default constructed objects represents that. The configuration is per-stream and does not change during the lifetime. Add a testcase with further extensibility in mind for further stream configurations. Task-number: QTBUG-142473 Pick-to: 6.11 6.10 Change-Id: I1e862f4996baa61f024f40516f74fc052a9b57c4 Reviewed-by: Alexey Edelev <semlanik@gmail.com> Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>