Add Velbus cover opening/closing (#79851)
Add Velbus cover opening/closing (#79851)

* Velbus cover/blind: indicate opening/closing

* Add docstrings because flake8 requirement

Co-authored-by: Niels Laukens <a802a5730c0da02a06106670cc12c7838c6e90dc@dest-unreach.be>
mezz64/home-assistant,w1ll1am23/home-assistant,w1ll1am23/home-assistant,mezz64/home-assistant