Write URL of the succeed requests to the sqlite database.

[literatesnow]

Thanks for oha! It's the perfect tool for the job.

This PR writes the URL (of successful requests) to the sqlite database. I'm using --rand-regex-url to make requests with a random correlation id that is propagated through the app and having the url in the sqlite db makes end to end tracing easy.

Suggestions on how to improve my rust are welcome.

[hatoo]

Sorry for the delayed response.
I was afraid of memory consumption. But I've realized that memory consumption would be minimal if we store random seed of each random-url instead of String and regenerate string when writing to SQLite. 64bit of random seed would be just enough.

I'll close PR because I want to handle this.
Thank you for your PR!