Grave digging and decomposition (#23646)

* Grave digging and decomposition

* fix

* update based on review comments

* code review

* remove unused field

Content.Shared/Atmos/Rotting/ProRottingContainerComponent.cs

@@ -0,0 +1,14 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Atmos.Rotting;
+
+/// <summary>
+/// Entities inside this container will rot at a faster pace, e.g. a grave
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed partial class ProRottingContainerComponent : Component
+{
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public float DecayModifier = 3f;
+}
+