feat(sprite): Add completions for sprite

sprite is the CLI tool for https://docs.sprites.dev

Signed-off-by: Jonathan Stacks <jonstacks@users.noreply.github.com>

plugins/sprite/README.md

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+# sprite plugin
+
+This plugin adds completion for the [Sprites CLI](https://docs.sprites.dev/cli/installation) (`sprite`).
+
+To use it, add `sprite` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... sprite)
+```
+
+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_DIR/completions/_sprite` completions script

plugins/sprite/sprite.plugin.zsh

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