[feature] Add option to tail the output/stick to scrolling to bottom

[marcomayer]

Currently, if there's not enough space in the terminal to show everything, bacon will show the top part of the output and hide the latest/tail output. This is fine for the common use-cases like bacon check, where the first error is often what one wants to see, but for bacon run it might be suboptimal. It would be great to have an option to always see the latest/tail output of the running command instead.

I know there's reverse, but it's not the same as it puts everything upside down.

So it would be great to have an option, maybe just tail (true/false) or similar that by default is disabled, but when enabled makes bacon always tail the output. Basically a sticky version of the already implemented scroll-to-bottom.

Happy to help with the implementation.