Desktop notification

## Describe your suggestion
Desktop notification when baritone arrive at destination

## Settings
- The sound that the notification produce
`notification_sound sound.ogg`
- Callback function
Let's say someone make a in game notification instead of a notification or something else. It would allow developper to add a notification to his own taste.

## Context
I would like it to be added because it would improve the quality of life when I use baritone at long distance as I often watch video or a movie while I use baritone for moving across large distance.