Add Java to Treesitter

lua/plugins/extend-treesitter.lua

@@ -0,0 +1,9 @@
+return {
+  "nvim-treesitter/nvim-treesitter",
+  opts = function(_, opts)
+    -- add parsers, without replacing the default ones
+    vim.list_extend(opts.ensure_installed, {
+      "java",
+    })
+  end,
+}