Add prediction to electric grills (#36241)

* Prediction for EntityHeaterSystem

* Switch to Entity<T>

* meh

* Move popup inside ChangeSetting

* Fix grill visually turning on when changing setting while power is off

* Add note about my failed quest

* Why isn't this an IDE warning?

* Move comment above switch expression in SettingPower

Content.Shared/Temperature/Components/EntityHeaterComponent.cs

@@ -0,0 +1,32 @@
+using Content.Shared.Temperature.Systems;
+using Robust.Shared.Audio;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Temperature.Components;
+
+/// <summary>
+/// Adds thermal energy to entities with <see cref="TemperatureComponent"/> placed on it.
+/// </summary>
+[RegisterComponent, Access(typeof(SharedEntityHeaterSystem))]
+[NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class EntityHeaterComponent : Component
+{
+    /// <summary>
+    /// Power used when heating at the high setting.
+    /// Low and medium are 33% and 66% respectively.
+    /// </summary>
+    [DataField]
+    public float Power = 2400f;
+
+    /// <summary>
+    /// Current setting of the heater. If it is off or unpowered it won't heat anything.
+    /// </summary>
+    [DataField, AutoNetworkedField]
+    public EntityHeaterSetting Setting = EntityHeaterSetting.Off;
+
+    /// <summary>
+    /// An optional sound that plays when the setting is changed.
+    /// </summary>
+    [DataField]
+    public SoundPathSpecifier? SettingSound;
+}