Sloth's subfloor vismask adventure (#35347)

* Add a subfloor vismask

Significantly cuts down on sent entity count.

* More optimisations

* Fix command

* Fixes

* namespace cleanup

* Review

* Vismasks

* Content update

* Bandaid

* awewa

* Revert these

* reh

* Update Content.Shared/SubFloor/TrayScannerComponent.cs

---------

Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>

Content.Shared/SubFloor/TrayScannerUserComponent.cs

@@ -0,0 +1,8 @@
+namespace Content.Shared.SubFloor;
+
+// Don't need to network
+/// <summary>
+/// Added to anyone using <see cref="TrayScannerComponent"/> to handle the vismask changes.
+/// </summary>
+[RegisterComponent]
+public sealed partial class TrayScannerUserComponent : Component;