Add prediction for standing states and mob states (#1937)

Content.Shared/GameObjects/Components/Mobs/State/IMobState.cs

@@ -0,0 +1,29 @@
+using Content.Shared.GameObjects.Components.Damage;
+using Content.Shared.GameObjects.EntitySystems;
+using Robust.Shared.Interfaces.GameObjects;
+
+namespace Content.Shared.GameObjects.Components.Mobs.State
+{
+    /// <summary>
+    ///     Defines the blocking effects of an associated <see cref="DamageState"/>
+    ///     (i.e. Normal, Critical, Dead) and what effects to apply upon entering or
+    ///     exiting the state.
+    /// </summary>
+    public interface IMobState : IActionBlocker
+    {
+        /// <summary>
+        ///     Called when this state is entered.
+        /// </summary>
+        void EnterState(IEntity entity);
+
+        /// <summary>
+        ///     Called when this state is left for a different state.
+        /// </summary>
+        void ExitState(IEntity entity);
+
+        /// <summary>
+        ///     Called when this state is updated.
+        /// </summary>
+        void UpdateState(IEntity entity);
+    }
+}