Fix Gizmos not drawing On<Pointer<Drag>>, Observers generally, and Triggered Systems

[kfc35]

Objective

• Fixes Pointer<Drag> observers do not render gizmos #22485
• Fixes Gizmos do not show from a triggered system #14566
• Fixes Gizmos will not render from a registered system #19119

Solution

• Implement queue() for both the Gizmos SystemParam and the GizmoBuffer SystemBuffer. Its body is the same as apply() except it acts on DeferredWorld.
• After much debugging, I discovered that the Gizmos system parameter never had apply() called on it when it was being used within an observer, which was why its internal SystemBuffer (GizmoBuffer) kept growing indefinitely. I saw that SystemParam’s also have a queue() function and was curious whether that was being called instead… and it was! So, I just implemented queue() in the same way that apply() was (after making sure it was OK to use a DeferredWorld in that way… and seems like it is OK?), and it solves the issue.
• Edit: I guess this problem has been described before in Deferred doesn't seem to work with observers #14597 , where the solution described there as well is to implement apply()
• Disclaimer: Not an ECS master, so someone with ECS mastery can make sure what I wrote makes sense.

Testing

The reproduction example in #22485 works now. A white square gizmo is drawn in the center if you drag inside the window.
I also tested against the examples in #14566 (both of them) and #19119 and the missing gizmos are drawn.

[kfc35]

I copied this from the macro rule for impl_system_param_tuple since it was complaining here too