feat(svelte): add formatter for svelte

lua/lazyvim/plugins/extras/lang/svelte.lua

@@ -66,4 +66,14 @@ return {
       })
     end,
   },
+
+  {
+    "stevearc/conform.nvim",
+    optional = true,
+    opts = {
+      formatters_by_ft = {
+        ["svelte"] = { "prettier" },
+      },
+    },
+  },
 }