position_shift_stack: Pisition function with some shift
In houyunhuang/ggcor: Extended tools for correlation analysis and visualization

Shift stack position function for annotation.

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position_shift_stack(vjust = 1, xshift = NA, yshift = NA, reverse = FALSE)

position_shift_fill(vjust = 1, xshift = NA, yshift = NA, reverse = FALSE)

`vjust`	Vertical adjustment for geoms that have a position (like points or lines), not a dimension (like bars or areas). Set to `0` to align with the bottom, `0.5` for the middle, and `1` (the default) for the top.
`xshift, yshift`	the offsets on x-axis and y-axis.
`reverse`	If `TRUE`, will reverse the default stacking order. This is useful if you're rotating both the plot and legend.