(Runner) add live-info to runner in a terminal
I often run adaptive in a terminal, and to me it seems very useful to print a status update or something so I can see how many points I already have and what the current loss is.
I would suggest:
- for the simple runner, just print a message with info every N'th point (where the user can specify N)
- for the BlockingRunner and AsyncRunner, print a message every
delta_t
seconds (similar to liveinfo in jupyter)