Remove Static Component NetIds (#4247)

* Remove the unnecessary NetID property from ComponentState.

* Remove Component.NetworkSynchronizeExistence.

* Removed Component.NetID.

* Adds component netID automatic generation.

* Removed NetIdAttribute from serverside components with no corresponding clientside registration.

* Completely remove static NetIds.

* Renamed NetIDAttribute to NetworkedComponentAttribute.

* Add GenerateNetIds calls to client and server entry points.
Add test to make sure auto generated NetIds are identical.

* Component changes when rebasing that I am too lazy to rewrite into the branch.

Co-authored-by: Vera Aguilera Puerto <6766154+Zumorica@users.noreply.github.com>

Content.Shared/Cooldown/ItemCooldownComponent.cs

@@ -1,7 +1,7 @@
-#nullable enable
+#nullable enable
 using System;
-using Content.Shared.NetIDs;
 using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
 using Robust.Shared.Players;
 using Robust.Shared.Serialization;
 using Robust.Shared.ViewVariables;
@@ -12,10 +12,10 @@ namespace Content.Shared.Cooldown
     ///     Stores a visual "cooldown" for items, that gets displayed in the hands GUI.
     /// </summary>
     [RegisterComponent]
+    [NetworkedComponent()]
     public sealed class ItemCooldownComponent : Component
     {
         public override string Name => "ItemCooldown";
-        public override uint? NetID => ContentNetIDs.ITEMCOOLDOWN;
 
         private TimeSpan? _cooldownEnd;
         private TimeSpan? _cooldownStart;
@@ -80,8 +80,7 @@ namespace Content.Shared.Cooldown
             public TimeSpan? CooldownStart { get; set; }
             public TimeSpan? CooldownEnd { get; set; }
 
-            public ItemCooldownComponentState() : base(ContentNetIDs.ITEMCOOLDOWN)
-            {
+            public ItemCooldownComponentState() {
             }
         }
     }