Guardians (Holoparasites) (#5140)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: Leon Friedrich <60421075+ElectroJr@users.noreply.github.com>
Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Server/Guardian/GuardianHostComponent.cs

@@ -0,0 +1,27 @@
+using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.Guardian
+{
+    /// <summary>
+    /// Given to guardian users upon establishing a guardian link with the entity
+    /// </summary>
+    [RegisterComponent]
+    [ComponentProtoName("GuardianHost")]
+    public sealed class GuardianHostComponent : Component
+    {
+        /// <summary>
+        /// Guardian hosted within the component
+        /// </summary>
+        /// <remarks>
+        /// Can be null if the component is added at any time.
+        /// </remarks>
+        public EntityUid? HostedGuardian;
+
+        /// <summary>
+        /// Container which holds the guardian
+        /// </summary>
+        [ViewVariables] public ContainerSlot GuardianContainer = default!;
+    }
+}