Add context menu to AdminMenu PlayerTab entries (#5904)

* XAML PlayerTab entries

* Move command execution to PlayerTab

* Move command logic to the AdminSystem

* Clean up

* Add examine and context menu keybind handling to PlayerTab

* Fix remote admin verbs

* Remove examine for now

* Add server verbs

* Fix requests of verb by non-admins

* Clean up AdminSystem.Menu

Content.Client/Administration/UI/Tabs/PlayerTab/PlayerTabEntry.xaml

@@ -1,5 +1,6 @@
 <ContainerButton xmlns="https://spacestation14.io"
-                 xmlns:customControls="clr-namespace:Content.Client.Administration.UI.CustomControls">
+                 xmlns:customControls="clr-namespace:Content.Client.Administration.UI.CustomControls"
+                 EnableAllKeybinds="True">
     <PanelContainer Name="BackgroundColorPanel"/>
     <BoxContainer Orientation="Horizontal"
                   HorizontalExpand="True"