Entity menu components + tests (#6162)

* init wip

* entity menu, examples, tests

* fix usage examples

* note react motion flow issue

* spacing and color tweaks

* icon hover transition

* add new icons

* tweak icon positioning / svg defs

* alert positioning

* icon x spacing

* set icon size based on the viewBox

* always set a width and height

* update download icon

* tweak icon positioning

* file cleanup

* update snap

* fix burger