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/Item/SharedItemComponent.cs

@@ -5,8 +5,8 @@ using Content.Shared.Hands.Components;
 using Content.Shared.Interaction;
 using Content.Shared.Interaction.Helpers;
 using Content.Shared.Inventory;
-using Content.Shared.NetIDs;
 using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
 using Robust.Shared.Maths;
 using Robust.Shared.Physics;
 using Robust.Shared.Players;
@@ -19,12 +19,11 @@ namespace Content.Shared.Item
     /// <summary>
     ///    Players can pick up, drop, and put items in bags, and they can be seen in player's hands.
     /// </summary>
+    [NetworkedComponent()]
     public abstract class SharedItemComponent : Component, IEquipped, IUnequipped, IInteractHand
     {
         public override string Name => "Item";
 
-        public override uint? NetID => ContentNetIDs.ITEM;
-
         /// <summary>
         ///     How much big this item is.
         /// </summary>
@@ -169,7 +168,7 @@ namespace Content.Shared.Item
         public Color Color { get; }
         public string? RsiPath { get; }
 
-        public ItemComponentState(int size, string? equippedPrefix, Color color, string? rsiPath) : base(ContentNetIDs.ITEM)
+        public ItemComponentState(int size, string? equippedPrefix, Color color, string? rsiPath)
         {
             Size = size;
             EquippedPrefix = equippedPrefix;