Camera3D gizmo should reflect editor values

[marshalltower]

Just wanted to add some visibility to this item. Don't believe it's a bug, just a missed item that I notices after moving from unity.

When updating the the values on a Camera3D for properties "FOV","Near", and "Far", only "FOV" actually updates the gizmo. There's no plane shown whatsoever for "Near" and adjusting "Far" makes no changes to the gizmo length. This makes it really difficult when designing things in 3-dimensions to see what is actually in range of the camera; especially if the viewing plane isn't rectangular.

[timothyqiu]

Could add an editor_draw_limits option to Camera3D and make the gizmo draw a line representing the valid frustum range.

[Calinou]

Thanks for the proposal! Consolidating in #8407.