[FEAT] Add support for bulk banning members

[AstreaTSS]

Problem Description

Exactly what the title says. No, I'm not making it up, this is genuinely a thing. It's not on the Discord docs, but it already has a PR ready, and discord.py has already added it in.

Proposed Solution

Add a bulk_ban function to Guild.

Alternatives Considered

No response

Additional Information

There's an argument not to add this in since it's never been mentioned by Discord, but it is extremely odd that discord.py would add it so casually. It's also in a PR state on the doc's GitHub, as mentioned before.

Code of Conduct

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