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UpnpActionRequest missing support for custom/unrecognized HTTP headers

UpnpActionRequest missing support for custom/unrecognized HTTP headers: a task in LegoFlow-SWE (Harbor dataset). In contrast, the existing FileInfo interface used for UPnP HTTP I/O callbacks already exposes unrecognized headers via an ExtraHeadersList . The same capability is needed for action…

The task

In contrast, the existing `FileInfo` interface used for UPnP HTTP I/O callbacks already exposes unrecognized headers via an `ExtraHeadersList`. The same capability is needed for action requests.

Part of Lego-X/LegoFlow-SWE.