feat(pack): Add cue language pack (#531)

lua/astrocommunity/pack/cue/README.md

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+# Cue Language Pack
+
+**Requirements:** `cue` must be in your `PATH` and executable
+
+This plugin pack does the following:
+
+- Adds `cue` Treesitter parsers
+- Adds `dagger` language server
+- Adds the following `null-ls` sources:
+  - [cueimports](https://github.com/asdine/cueimports)

lua/astrocommunity/pack/cue/init.lua

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+local utils = require "astronvim.utils"
+return {
+  -- Cue support
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if opts.ensure_installed ~= "all" then
+        opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "cue")
+      end
+    end,
+  },
+
+  {
+    "jay-babu/mason-null-ls.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, { "cueimports" }) end,
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "dagger") end,
+  },
+}