Add a garbage collection component for grid movement (#7776)

If we move a station and there's thousands of bullets in the way we shouldn't just indefinitely lag the server as a result.

Content.Server/Shuttles/Components/SpaceGarbageComponent.cs

@@ -0,0 +1,8 @@
+namespace Content.Server.Shuttles.Components;
+
+/// <summary>
+///     Cleanup component that deletes the entity if it has a cross-grid collision.
+///     Useful for small, unimportant items like bullets to avoid generating many contacts.
+/// </summary>
+[RegisterComponent]
+public sealed class SpaceGarbageComponent : Component {}