Need phone compatible placement options

[jbienzms]

We need a way to place anchors and do Ray-Based alignment on phones. The current approach uses an new version of TapToPlace which depends on MRTK solvers. These solvers would theoretically work in the future if MRTK supported ARFoundation, but they do not work right now. A solution is needed that will likely depend on screen taps and ARCore plane intersections.