Move Access & AccessReader to shared. (#5798)

* git mv

* Move Access Component & system.

- Name space changes
- Rename AccessReader to AccessReaderComponent
- Also need an abstract TryGetSlot function for SharedInventoryComponent

* better TryGetSlot

* Ah yes, tests exist.

Content.Shared/Access/Components/AccessComponent.cs

@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+using Content.Shared.Access.Systems;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.Set;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Shared.Access.Components
+{
+    /// <summary>
+    ///     Simple mutable access provider found on ID cards and such.
+    /// </summary>
+    [RegisterComponent]
+    [Friend(typeof(AccessSystem))]
+    public class AccessComponent : Component
+    {
+        public override string Name => "Access";
+
+        [DataField("tags", customTypeSerializer: typeof(PrototypeIdHashSetSerializer<AccessLevelPrototype>))]
+        [ViewVariables]
+        public HashSet<string> Tags = new();
+    }
+}