feat(pack): Add swift pack (#606)

Co-authored-by: Kirk Paradis <[email protected]>
Co-authored-by: Kai Löhnert <[email protected]>

lua/astrocommunity/pack/swift/README.md

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+# Swift Language Pack
+
+## Note: xbase is a WIP plugin, and the experience provided by this plugin might be lackluster
+
+**Requirements:**
+
+1. Make sure you have [sourcekit-lsp](https://github.com/apple/sourcekit-lsp) installed on your machine.
+
+2. Install Xcode Device Simulators:
+   To enable simulator functionality from within Neovim, you need to have Xcode Device Simulators installed on your machine. You can install these simulators from Xcode.
+
+3. Mappings:
+   The default mappings for the xbase plugin overlap with AstroNvim's default. Therefore, you should set the mappings yourself.
+   Refer to [xBase](https://github.com/kkharji/xbase#neovim-3) documentation for more options.
+
+```lua
+opts = {
+  -- ... (other options)
+
+  mappings = {
+    enable = true,
+    build_picker = "<leader>rb", -- Set to 0 to disable
+    run_picker = "<leader>ra", -- Set to 0 to disable
+    watch_picker = 0, -- Set to 0 to disable
+    all_picker = 0, -- Set to 0 to disable
+    toggle_split_log_buffer = 0,
+    toggle_vsplit_log_buffer = "<leader>rs",
+  },
+
+  -- ... (other options)
+}
+```

lua/astrocommunity/pack/swift/init.lua

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+local utils = require "astronvim.utils"
+
+return {
+  {
+    "xbase-lab/xbase",
+    ft = {
+      "swift",
+      "objcpp",
+      "objc",
+    },
+    run = "make install", -- or "make install && make free_space" (not recommended, longer build time)
+    dependencies = {
+      "neovim/nvim-lspconfig",
+      -- "nvim-telescope/telescope.nvim", -- optional
+      -- "nvim-lua/plenary.nvim", -- optional/requirement of telescope.nvim
+      -- "stevearc/dressing.nvim", -- optional (in case you don't use telescope but something else)
+    },
+    init = function() require("astronvim.utils.lsp").setup "sourcekit-lsp" end,
+  },
+  {
+    "jose-elias-alvarez/null-ls.nvim",
+    opts = function(_, opts)
+      local nls = require "null-ls"
+      if type(opts.sources) == "table" then
+        vim.list_extend(opts.sources, {
+          nls.builtins.formatting.swift_format,
+        })
+      end
+    end,
+  },
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if opts.ensure_installed ~= "all" then
+        opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "swift")
+      end
+    end,
+  },
+  {
+    "jay-babu/mason-nvim-dap.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "codelldb") end,
+  },
+}