Remove graphics utilities in favour of {ggdist}

[mitchelloharawild]

The dependency is not needed thanks to the wonderful work by @mjskay at https://github.com/mjskay/ggdist/.
The usage in {fabletools} will be updated to use (and suggest) the {ggdist} package, reducing the dependency tree for all associated packages.

I don't expect that many people use geom_hilo_ribbon() or geom_hilo_linerange() yet, so the deprecation can happen fairly quickly (perhaps 1 major release).

[mitchelloharawild]

Waiting for mjskay/ggdist#111 to allow {fabletools} to use {ggdist} before {distributional} can drop geom_*() functions.

[dmi3kno]

Trimming down heavy dependencies, e.g. {ggplot2} is very much appreciated!