feat(pack): add cpp base pack

lua/astrocommunity/pack/cpp/README.md

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+# cpp Language Pack
+
+This plugin pack does the following:
+
+- Adds `cpp` `c` Treesitter parser
+- Adds `clangd` language server
+- Adds `clang-format` formatter
+
+tips: the offset_encondings of clangd will confilicts whit null-ls, so add the following file in your user_config.
+```lua
+-- <user_config_path>/lsp/config/clangd.lua
+return {
+  capabilities = {
+     offsetEncoding = "utf-8",
+  },
+}
+```

lua/astrocommunity/pack/cpp/cpp.lua

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+local utils = require "astronvim.utils"
+return {
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if opts.ensure_installed ~= "all" then
+        opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, { "cpp", "c" })
+      end
+    end,
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "clangd") end,
+  },
+  {
+    "jay-babu/mason-null-ls.nvim",
+    opts = function(_, opts)
+      opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "clang-format")
+    end,
+  },
+}