Represents a mode (tab) in the attachment picker.

Each mode defines a specific type of attachment that users can select or create. Implement this interface to create custom picker modes, or use the built-in implementations:

• GalleryPickerMode - Pick images and videos from device gallery

• FilePickerMode - Pick files from device storage

• CameraPickerMode - Capture photos or videos with the camera

• PollPickerMode - Create a poll

• CommandPickerMode - Select a slash command