Add an experimental hidden-service statistics option to torrc
With #15254 (moved), an idea was brought up to have a second torrc option for experimental hidden-service statistics.
Currently we have HiddenServiceStatistics
that just enables them all. As this ticket is being written, only volunteer relays enable it but we are considering making this option on by default thus new future statistics would end up also enabled by default which is not maybe what we want.
Thus adding an option for experimental statistics in torrc which could look like this:
HiddenServiceStatistics 0|1 (default: 1)
HiddenServiceExperimentalStatistics 0|1 (default: 0)