Backport of "ges: Add setters to FrameCompositionMeta" into 0.22
requested to merge gstreamer-backport-bot/gstreamer-rs:mr-1475-backport-into-0.22-gescompositionmeta_setters into 0.22
Backport of !1475 (merged) "ges: Add setters to FrameCompositionMeta".
Commits:
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426d95bc
ges: Add setters to FrameCompositionMeta