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