feat(1password): make completion loading async

plugins/1password/1password.plugin.zsh

@@ -1,9 +1,15 @@
 # Do nothing if op is not installed
 (( ${+commands[op]} )) || return
 
-# Load op completion
-eval "$(op completion zsh)"
-compdef _op op
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `op`. Otherwise, compinit will have already done that.
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_op" ]]; then
+  typeset -g -A _comps
+  autoload -Uz _op
+  _comps[op]=_op
+fi
+
+op completion zsh >| "$ZSH_CACHE_DIR/completions/_op" &|
 
 # Load opswd function
 autoload -Uz opswd