[Feature] add join message, and announce system

[Zarkness]

Have you checked the Wiki

• [X] I have checked the Wiki and determined that this feature does not exist.

Is there a duplicate issue

• [X] I have looked through the existing issue and found no duplicate content, or a more detailed description of the existing issue.

Detailed description

add a welcome message system where you can create different welcome messages, with conditions etc...

and add a system of announcements, that you have conditions to toggle them.

ItsFlicker I would like to talk to you and ask you something we can talk by discord or if you want we can talk about it here.

[Zarkness]

add this option