feat: add kotlin language support with basic features

lua/lazyvim/plugins/extras/lang/kotlin.lua

@@ -0,0 +1,26 @@
+return {
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      vim.list_extend(opts.ensure_installed, {
+        "kotlin",
+      })
+    end,
+  },
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      vim.list_extend(opts.ensure_installed, {
+        "kotlin-language-server",
+      })
+    end,
+  },
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      servers = {
+        kotlin_language_server = {},
+      },
+    },
+  },
+}