Make mechanism behaviors properly update, fix eating and drinking (#2472)

* Make mechanisms properly update and fix eating and drinking

* Remove outdated component ignores

* Fix nullable error

* Fix mechanism behavior events

* Remove unnecessary code

Content.Shared/GameObjects/Components/Body/Mechanism/IMechanism.cs

@@ -1,4 +1,7 @@
 #nullable enable
+using System;
+using System.Collections.Generic;
+using Content.Shared.GameObjects.Components.Body.Behavior;
 using Content.Shared.GameObjects.Components.Body.Part;
 using Robust.Shared.Interfaces.GameObjects;
 
@@ -10,6 +13,8 @@ namespace Content.Shared.GameObjects.Components.Body.Mechanism
 
         IBodyPart? Part { get; set; }
 
+        IReadOnlyDictionary<Type, IMechanismBehavior> Behaviors { get; }
+
         /// <summary>
         ///     Professional description of the <see cref="IMechanism"/>.
         /// </summary>
@@ -55,6 +60,21 @@ namespace Content.Shared.GameObjects.Components.Body.Mechanism
         /// </summary>
         BodyPartCompatibility Compatibility { get; set; }
 
+        /// <summary>
+        ///    Adds a behavior if it does not exist already.
+        /// </summary>
+        /// <typeparam name="T">The behavior type to add.</typeparam>
+        /// <returns>
+        ///     True if the behavior already existed, false if it had to be created.
+        /// </returns>
+        bool EnsureBehavior<T>(out T behavior) where T : IMechanismBehavior, new();
+
+        bool HasBehavior<T>() where T : IMechanismBehavior;
+
+        bool TryRemoveBehavior<T>() where T : IMechanismBehavior;
+
+        void Update(float frameTime);
+
         // TODO BODY Turn these into event listeners so they dont need to be exposed
         /// <summary>
         ///     Called when the containing <see cref="IBodyPart"/> is attached to a