The overlay options in the image/uv editor is hidden in side panels and menus. Sometimes this panel is even hidden, while still useful.
The goal of this task is to introduce an overlay pop-over just like the overlay-popover of the 3d viewport.
Popover has
UV Stretching (only available in the UV mode, when active object mode is a mesh and in OB_EDIT mode)
Display As (only available in the UV mode, when active object mode is a mesh and in OB_EDIT mode)
Show Modified (only available in the UV mode, when active object mode is a mesh and in OB_EDIT mode)
Show UV Edges (including opacity slider; available UV, View, Paint, when active object mode is a mesh and in OB_EDIT mode)
Like the 3d viewport, there will be a editor toggle to enable/disable the overlays
See {T80767}