feat(util): rest-client (#3915)

## What is this PR for?

Kulala is a minimal REST-client implementation that allows you to make
HTTP requests from within Neovim

## Does this PR fix an existing issue?

No but simplifies life

## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/extras/util/rest.lua

@@ -0,0 +1,25 @@
+vim.filetype.add({
+  extension = {
+    ["http"] = "http",
+  },
+})
+return {
+  {
+    "mistweaverco/kulala.nvim",
+    ft = "http",
+    keys = {
+      { "<leader>R", "", desc = "+Rest" },
+      { "<leader>Rs", "<cmd>lua require('kulala').run()<cr>", desc = "Send the request" },
+      { "<leader>Rt", "<cmd>lua require('kulala').toggle_view()<cr>", desc = "Toggle headers/body" },
+      { "<leader>Rp", "<cmd>lua require('kulala').jump_prev()<cr>", desc = "Jump to previous request" },
+      { "<leader>Rn", "<cmd>lua require('kulala').jump_next()<cr>", desc = "Jump to next request" },
+    },
+    opts = {},
+  },
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = {
+      ensure_installed = { "http", "graphql" },
+    },
+  },
+}