Add Channel Filtering Option for Server-Wide Message Deletion

[Nikolayavilov0]

Currently, Discrub allows users to delete all messages from a server or manually select each channel individually, which can be time-consuming. It would be helpful to add a channel filtering option that enables users to delete messages from specific channels within a server without having to choose every channel individually or delete all messages. This feature would streamline the deletion process, giving users more control over which channels to include or exclude