limit bilibili api rate to avoid ip ban

[BUnipendix]

Checklist (Your issue will be automatically closed if you delete this part)

• I make sure that there are no existing issues - open or closed - which I could contribute my information to.
• I believe this feature request will benefit more than 10% of users, not just myself.

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** Description
I used a script to add the followers of my Bilibili account to the pipepipe and I got IP Bans for too fast api fetch rate.

When I only had a dozen followers before, I also encountered situations where I got ip ban. But as long as I entered anyone's homepage and fresh, the ban would be removed.