feat(timoni): add completion plugin (#12802)

plugins/timoni/README.md

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+# Timoni plugin
+
+This plugin adds completion for [Timoni](https://timoni.sh), a package manager for Kubernetes, powered by CUE and inspired by Helm.
+
+To use it, add `timoni` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... timoni)
+```

plugins/timoni/timoni.plugin.zsh

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