Add Galoshes slowdown over slippery surfaces (#30967)

* first draft

* Fixed it all, just need to rename stuff

* Rename and add comments

* Clean-up

* Access added

Content.Shared/Clothing/EntitySystems/SpeedModifierContactCapClothingSystem.cs

@@ -0,0 +1,20 @@
+using Content.Shared.Clothing.Components;
+using Content.Shared.Inventory;
+using Content.Shared.Movement.Events;
+
+namespace Content.Shared.Clothing.EntitySystems;
+
+public sealed class SpeedModifierContactCapClothingSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<SpeedModifierContactCapClothingComponent, InventoryRelayedEvent<GetSpeedModifierContactCapEvent>>(OnGetMaxSlow);
+    }
+
+    private void OnGetMaxSlow(Entity<SpeedModifierContactCapClothingComponent> ent, ref InventoryRelayedEvent<GetSpeedModifierContactCapEvent> args)
+    {
+        args.Args.SetIfMax(ent.Comp.MaxContactSprintSlowdown, ent.Comp.MaxContactWalkSlowdown);
+    }
+}