Add running metrics for each successful benchmarking run #202
Description
When benchmarking a URL with a high number, it can be aggravating to have to wait for all the requests to finish to see the results:
Benchmarking URL http://localhost:8881/block-category-common/ ...
Priming network...
Benchmarking 1 / 50...Success.
Benchmarking 2 / 50...Success.
Benchmarking 3 / 50...Success.
Benchmarking 4 / 50...Success.
Benchmarking 5 / 50...Success.
Benchmarking 6 / 50...Success.
Benchmarking 7 / 50...Success.
Benchmarking 8 / 50...Success.
Benchmarking 9 / 50...Success.
Benchmarking 10 / 50...Success.
Benchmarking 11 / 50...Success.
Benchmarking 12 / 50...Success.
Benchmarking 13 / 50...Success.
Benchmarking 14 / 50...Success.
Benchmarking 15 / 50...Success.
Benchmarking 16 / 50...
It would be very nice if after each “Success” there could be a one-line summary of the current median web vitals collected up until that point. This would give the user a sense of the direction in which things are going, without having to wait for the benchmarking to complete.