feat(ngrok): add completion plugin (#12826)

plugins/ngrok/README.md

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+# ngrok plugin
+
+This plugin adds completion for the [ngrok](https://ngrok.com) CLI.
+
+To use it, add `ngrok` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... ngrok)
+```
+
+This plugin does not add any aliases.
+
+## Cache
+
+This plugin caches the completion script and is automatically updated asynchronously when the plugin is
+loaded, which is usually when you start up a new terminal emulator.
+
+The cache is stored at:
+
+- `$ZSH_CACHE/completions/_ngrok` completions script

plugins/ngrok/ngrok.plugin.zsh

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+# Autocompletion for ngrok
+if (( ! $+commands[ngrok] )); then
+  return
+fi
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `ngrok`. Otherwise, compinit will have already done that.
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_ngrok" ]]; then
+  typeset -g -A _comps
+  autoload -Uz _ngrok
+  _comps[ngrok]=_ngrok
+fi
+
+ngrok completion zsh >| "$ZSH_CACHE_DIR/completions/_ngrok" &|