feat(pack): adds angular pack (#254)

Co-authored-by: Axel Calixte <axelcalixte@disr.it>

lua/astrocommunity/pack/angular/README.md

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+# Angular Language Pack
+
+This plugin pack does the following:
+
+- Adds [typescript pack](https://github.com/AstroNvim/astrocommunity/tree/main/lua/astrocommunity/pack/typescript)
+- Adds [html-css pack](https://github.com/AstroNvim/astrocommunity/tree/main/lua/astrocommunity/pack/html-css)
+- Adds `angular` Treesitter parser with [`nvim-treesitter-angular`](https://github.com/elgiano/nvim-treesitter-angular)
+- Adds `angular` language servers

lua/astrocommunity/pack/angular/angular.lua

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+local utils = require "astronvim.utils"
+
+return {
+  { import = "astrocommunity.pack.typescript" },
+  { import = "astrocommunity.pack.html-css" },
+  {
+    "nvim-treesitter/nvim-treesitter",
+    dependencies = { { "elgiano/nvim-treesitter-angular", branch = "topic/jsx-fix" } },
+    opts = function(_, opts)
+      if opts.ensure_installed ~= "all" then
+        opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "angular")
+      end
+    end,
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "angularls") end,
+  },
+}