CLI: Support --optimize flag for crawl mode

[jpeddicord]

Title. Not much work to support this; the CLI just doesn't do this when crawling a directory. Overkill for many scenarios, but we could add some heuristics to only optimize above a certain threshold (see #26).

I'm imagining this'll be useful in situations like this:

askalono crawl --optimize --glob '*' my-source-directory

[jpeddicord]

Closing in favor of #35