Adding multi-user support

[koszzz]

Thanks for your wonderful library But when I was using it, I used multiple accounts in order to break the rate limit. As a result, multiple Scraper instances were created, which resulted in a large memory footprint for my service. I think adding multi-user support might be a better approach. Thanks. (The content has been translated, and some words may be inappropriate)

[malone6]

I have the same needs. Actually, another repo(twscrape) has already implemented. but it needs asynchronous writing, can't compatible with the framework I am using.