delete blacklisted attachments from message and replace with webhook

[ayyhimself]

new crazy amazing feature where if someone sends a message with a forbidden attachment then that attachment is removed and the whole message is replaced as a webhook with only the good attachments
works server wide
config in guild config

[danthe1st]

Please address the changes I wrote in the review comments.

Also, please use a proper/professional commit message. You can change the commit message of your existing commit using git commit --amend (optionally with -m <message>) and then force-pushing to your branch with git push --force-with-lease.

[danthe1st]

Please also fix the checkstyle errors. We use tabs for indentation.

[danthe1st]

Please see the comments.

Other things to eventually convert to a filter:

• AutoMod (please do this in this PR)
• suggestions (can be another PR)
• code formatting in help channel (can be in another PR)

It might als be a good idea to add an overload to WebhookUtil.replaceMessage without embeds/attachments to make the code simpler instead of having to add a null argument wherever calling it.

[ayyhimself]

[danthe1st]

Please also fix the CI failures.

[danthe1st]

Please still fix the CI failures.

[danthe1st]

testing results