Add support for HTTP redirect in IP filtering feature

[jakubkuc]

Passing allow_redirects flag to requests should be handled in requests-hardened.
At the moment it is not possible and additional code is needed to be able to use redirects while using requests-hardened and that is not optimal for Saleor.

[NyanKiyoshi]

I removed the bug label as the IP filtering feature works as intended, it's a feature request.

But the following could be improved:

1. Documentation should warn about the limitation
2. The configuration should reject mixing ip_filter_enable=True and never_redirect=False as this is unsupported