feat: add applied_tags parameter to Webhook.send()

[tyrantlink]

Summary

Added applied_tags parameter to Webhook.send(), allowing for forum channel tags to be applied through a webhook.

Information

• This PR fixes an issue.
• 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, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[Dorukyum]

Docs should be fine now, will approve after testing the parameter myself just in case.

[Dorukyum]

I think the parameter should accept a list of ForumTags too to mirror the one in ForumChannel.create_thread. Could use a type of list[Snowflake | ForumTag] and then take IDs from the tag objects.

[Dorukyum]

I'll implement the suggestion I made earlier in a different pull request, thanks.