Add power sinks (#8020)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/PowerSink/PowerSinkComponent.cs

@@ -0,0 +1,8 @@
+namespace Content.Server.PowerSink
+{
+    /// <summary>
+    /// Absorbs power up to its capacity when anchored then explodes.
+    /// </summary>
+    [RegisterComponent]
+    public sealed class PowerSinkComponent : Component {}
+}