Draft: videoconvert: Add vulkan converter, take 2
This MR creates a videoconvert plugin which can be loaded from the videoadapter (part of !1812).
Based on: !1644 (merged)
Supersedes: !1704
This MR creates a videoconvert plugin which can be loaded from the videoadapter (part of !1812).
Based on: !1644 (merged)
Supersedes: !1704