add jsonnet support

lua/lazyvim/plugins/extras/lang/jsonnet.lua

@@ -0,0 +1,28 @@
+return {
+  { "google/vim-jsonnet" },
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      servers = {
+        -- Ensure mason installs the server
+        jsonnet_ls = {},
+      },
+    },
+  },
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if type(opts.ensure_installed) == "table" then
+        vim.list_extend(opts.ensure_installed, { "jsonnet" })
+      end
+    end,
+  },
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      vim.list_extend(opts.ensure_installed, {
+        "jsonnet-language-server",
+      })
+    end,
+  },
+}