Support custom `max_retries`

[yidafu]

I crawl a web site which network is very bad, I have to refresh 5 times or even more to get a normal response. I tried to configure retry_request_errors, but found that only retry 3 time.

https://github.com/vifreefly/kimuraframework/blob/96fe695fe4cbcf1182389e2f867debeca746022d/lib/kimurai/capybara_ext/session.rb#L11

It would be great to improve on Supporting custom max_retries.

[imtiazwazir]

+1