[Feature request] option for output consumer to output in it's own fixed window/panel

[marcelbeumer]

First of all, thanks for working on neotest! I'm looking for the right workflow(s), also peeking at other established editors.

I think it would be be helpful if the output consumer, optionally, can open_output in it's own fixed and separate window at the bottom, just like the summary has it's own fixed panel on the right (positions configurable + possible to just manipulate like any other window). Together with open_on_run, you would get a classic IDE experience like

--------------------------------------------
|                                          |
|              code/test                   |
|       (keymap to run last test)          |
|                                          |
|------------------------------------------|
|                                          |
|             test results                 |
|     (auto update + scroll to bottom)     |
|                                          |
-------------------------------------------|

What do you think?