plot: consider implementing a gradient
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- Go
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Description
the original query had landed there: https://github.com/go-hep/hep/issues/701
it would be great to allow some filling an area of a plot with a gradient.
_e.g.:_ something along the lines of


as noted in the the original issue, there are already a couple of gradient implementations:
- https://github.com/lucasb-eyer/go-colorful/blob/master/doc/gradientgen/gradientgen.go
- https://godoc.org/golang.org/x/exp/shiny/iconvg/internal/gradient
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