feat(pack): add dart (#136)

- Adds `dart` ands `yaml` treesitter parsers
- Adds `dartls` language server
- Adds `flutter-tools.nvim` for language specific tooling

lua/astrocommunity/pack/dart/README.md

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+# Dart Language Pack
+
+This plugin pack does the following:
+
+- Adds `dart` Treesitter parsers
+- Adds `dartls` language server
+- Adds [flutter-tools.nvim](https://github.com/akinsho/flutter-tools.nvim) for language specific tooling
+- Adds [YAML language support](../yaml)

lua/astrocommunity/pack/dart/dart.lua

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+local utils = require "astrocommunity.utils"
+return {
+  { import = "astrocommunity.pack.yaml" },
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      -- Ensure that opts.ensure_installed exists and is a table or string "all".
+      if not opts.ensure_installed then
+        opts.ensure_installed = {}
+      elseif opts.ensure_installed == "all" then
+        return
+      end
+      -- Add the "dart" and "yaml" language to opts.ensure_installed.
+      utils.list_insert_unique(opts.ensure_installed, "dart")
+    end,
+  },
+  {
+    "akinsho/flutter-tools.nvim",
+    ft = { "dart" },
+    init = function() utils.list_insert_unique(astronvim.lsp.skip_setup, "dartls") end,
+    opts = {
+      lsp = require("astronvim.utils.lsp").config "dartls",
+      debugger = {
+        enabled = true,
+      },
+    },
+    dependencies = {
+      { "nvim-lua/plenary.nvim" },
+      {
+        "jay-babu/mason-nvim-dap.nvim",
+        opts = function(_, opts)
+          -- Ensure that opts.ensure_installed exists and is a table.
+          if not opts.ensure_installed then opts.ensure_installed = {} end
+          utils.list_insert_unique(opts.ensure_installed, "dart")
+        end,
+      },
+    },
+  },
+  -- Add "flutter" extension to "telescope"
+  { "nvim-telescope/telescope.nvim", opts = function() require("telescope").load_extension "flutter" end },
+}