feat(pack): add svelte language pack

lua/astrocommunity/pack/svelte/README.md

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+# Svelte Language Pack
+
+This plugin pack does the following:
+
+- Adds `svelte` Treesitter parsers
+- Adds `svelte` language server
+- Adds `js-debug-adapter` for debugging
+- Adds [nvim-dap-vscode-js](https://github.com/mxsdev/nvim-dap-vscode-js) for debugging

lua/astrocommunity/pack/svelte/svelte.lua

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+local utils = require "astrocommunity.utils"
+return {
+  {
+    "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 required file types to opts.ensure_installed.
+      utils.list_insert_unique(opts.ensure_installed, "svelte")
+    end,
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts)
+      -- Ensure that opts.ensure_installed exists and is a table.
+      if not opts.ensure_installed then opts.ensure_installed = {} end
+      -- Add tsserver to opts.ensure_installed using vim.list_extend.
+      utils.list_insert_unique(opts.ensure_installed, "svelte")
+    end,
+  },
+  {
+    "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
+      -- Add to opts.ensure_installed using table.insert.
+      utils.list_insert_unique(opts.ensure_installed, "js")
+    end,
+  },
+}