feat: Add docs-friendly configuration loader stub

Author: cranberry3148

src/main/kotlin/cc/modlabs/kpaper/main/KPluginExtensions.kt

@@ -0,0 +1,9 @@
+package cc.modlabs.kpaper.main
+
+/**
+ * Docs-friendly configuration loader stub. Returns a new instance of T using the no-arg constructor.
+ * Replace with your own implementation or bind to your config library.
+ */
+inline fun <reified T : Any> KPlugin.loadConfiguration(): T =
+    T::class.java.getDeclaredConstructor().newInstance()
+