feat(pack): add cpp base pack (#295)

Co-authored-by: Micah Halter <[email protected]>

lua/astrocommunity/pack/cpp/README.md

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+# C/C++ Language Pack
+
+This plugin pack does the following:
+
+- Adds `cpp` `c` `objc` `cuda` `proto` Treesitter parsers
+- Adds `clangd` language server
+- Adds `clang-format` formatter
+- Adds [clangd_extensions.nvim](https://github.com/p00f/clangd_extensions.nvim) for language specific tooling
+- Adds [cmake-tools.nvim](https://github.com/Civitasv/cmake-tools.nvim) for building and debugging
+
+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/init.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", "objc", "cuda", "proto" })
+      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,
+  },
+  {
+    "p00f/clangd_extensions.nvim",
+    ft = { "c", "cpp", "objc", "objcpp", "cuda", "proto" },
+    init = function() utils.list_insert_unique(astronvim.lsp.skip_setup, "clangd") end,
+    opts = function() return { server = require("astronvim.utils.lsp").config "clangd" } end,
+  },
+  {
+    "Civitasv/cmake-tools.nvim",
+    ft = { "c", "cpp", "objc", "objcpp", "cuda", "proto" },
+    dependencies = {
+      {
+        "jay-babu/mason-nvim-dap.nvim",
+        opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "codelldb") end,
+      },
+    },
+    opts = {},
+  },
+}