feat(extras): rego language support

It took a while, but finally we can work with
[OPA](https://www.openpolicyagent.org/) like a BOSS in neovim.

Linking some PR-s that had to land in the past couple of months to make this config as
simple as it is now:
- treesitter commentstring support in https://github.com/JoosepAlviste/nvim-ts-context-commentstring/pull/108
- regols support in nvim-lspconfig: https://github.com/neovim/nvim-lspconfig/pull/2721
- regols support in mason-registry: https://github.com/mason-org/mason-registry/pull/4896
- regols support in mason-lspconfig: https://github.com/williamboman/mason-lspconfig.nvim/pull/403
- regal support in nvim-lspconfig: https://github.com/neovim/nvim-lspconfig/pull/3071
- regal support in mason-registry: https://github.com/mason-org/mason-registry/pull/5717
- regal support in mason-lspconfig: https://github.com/williamboman/mason-lspconfig.nvim/pull/426

Signed-off-by: Zoltán Reegn <zoltan.reegn@gmail.com>

lua/lazyvim/plugins/extras/lang/rego.lua

@@ -0,0 +1,20 @@
+return {
+  recommended = {
+    ft = "rego",
+  },
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      servers = {
+        regols = {},
+        regal = {},
+      },
+    },
+  },
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = {
+      ensure_installed = { "rego" },
+    },
+  },
+}