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/Placeable/SharedPlaceableSurfaceComponent.cs

@@ -1,16 +1,16 @@
 #nullable enable
 using System;
-using Content.Shared.NetIDs;
 using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
 using Robust.Shared.Maths;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.Placeable
 {
+    [NetworkedComponent()]
     public abstract class SharedPlaceableSurfaceComponent : Component
     {
         public override string Name => "PlaceableSurface";
-        public override uint? NetID => ContentNetIDs.PLACEABLE_SURFACE;
         public virtual bool IsPlaceable { get; set; }
         public virtual bool PlaceCentered { get; set; }
         public virtual Vector2 PositionOffset { get; set; }
@@ -23,7 +23,7 @@ namespace Content.Shared.Placeable
         public readonly bool PlaceCentered;
         public readonly Vector2 PositionOffset;
 
-        public PlaceableSurfaceComponentState(bool placeable, bool centered, Vector2 offset) : base(ContentNetIDs.PLACEABLE_SURFACE)
+        public PlaceableSurfaceComponentState(bool placeable, bool centered, Vector2 offset)
         {
             IsPlaceable = placeable;
             PlaceCentered = centered;