feat: use delete_message_seconds for Guild/Member.ban (#800)

[teaishealthy]

Summary

Resolves #800

Checklist

• [ ] If code changes were made then they have been tested.
  • [x] I have updated the documentation to reflect the changes.
  • [x] I have run task pyright and fixed the relevant issues.
• [x] This PR fixes an issue.
• [x] This PR adds something new (e.g. new method or parameters).
• [ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)