public void suggestionProcessor(final @NonNull SuggestionProcessor<C> suggestionProcessor) {
        this.suggestionProcessor = suggestionProcessor;
    }
Sets the command suggestion processor.
<p>
This will be called every time {@link SuggestionFactory#suggest(CommandContext, String)} is called, to process the list
of suggestions before it's returned to the caller.

@param suggestionProcessor the new command suggestion processor
@see #suggestionProcessor()
cloud-core/src/main/java/org/incendo/cloud/CommandManager.java