Axis3 causes markers of a meshscatter to be transformed

[ffreyer]

On master, beta-20 (pre lighting merge, #3113), lighting (#3246) (In GLMakie, but this should be the same across backends)

fig = Figure()
a = Axis3(fig[1, 1])
ps = decompose(Point3f, Sphere(Point3f(0), 1f0), 10)
arrows!(a, map(p -> Point3f(10, 10, 1) .* p .+ Point3f(0), ps), Vec3f.(ps))
fig

This is happening because the scaling factor derived from the positional argument is applied to the vertices of the scattered mesh as well.

To fix this, we should probably add a transform_marker attribute to meshscatter and adjust Axis3 to not normalize to a unit box (in terms of internal coordinates, not visuals). I tried this a bit in the lighting pr but ran into issues with near/far. I'll try to look into this again after we get done with v0.20.