Better support for media button long press

Hey! I was trying to make a profile that reads my notifications when I ask for the assistant, which I think would be the equivalent of long pressing the media button. However, I'm not able to make it work with the current options.

I'm aware of the multimedia button options, and the Assistant Request, but none work as intended. The last one works, but also opens a screen showing how to enable google assistant.

I was able to make it work with MacroDroid, which btw shows in the logcats as media button long press activity, when requesting the assistant. It also prompts me to select MacroDroid or Google when requesting the assistant.