feat(stripe): add completion plugin (#12064)

Co-authored-by: Carlo Sala <carlosalag@protonmail.com>

plugins/stripe/README.md

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+# Struoe
+
+This plugin provides completion for the [Stripe CLI](https://stripe.com/docs/stripe-cli).
+
+To use it add stripe to the plugins array in your zshrc file.
+
+```bash
+plugins=(... stripe)
+```

plugins/stripe/stripe.plugin.zsh

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