Add LSP support to Kotlin

`lsp-mode` has built in support for Kotlin. This makes it automatically used if you use the `+lsp` flag.

modules/lang/kotlin/config.el

@@ -1,5 +1,10 @@
 ;;; lang/kotlin/config.el -*- lexical-binding: t; -*-
 
+(use-package! kotlin-mode
+  :init 
+  (when (featurep! +lsp)
+    (add-hook 'kotlin-mode-local-vars-hook #'lsp!)))
+
 (after! kotlin-mode
   (set-docsets! 'kotlin-mode "Kotlin")