feat: Add ability to inspect build information and features at runtime

Also re-adds ability to inspect used features

src/admin/server/mod.rs

@@ -52,4 +52,10 @@ pub enum ServerCommand {
 
 	/// Shutdown the server
 	Shutdown,
+
+	/// List features built into the server
+	ListFeatures,
+
+	/// Build information
+	BuildInfo,
 }