Feature/node settings apy playground (#1677) (#2738)

* initial ui for test my node

use svg for node path

add stories for test my node

* add initial rewards calculation

* update validation for rewards playground

* init playground with default values

* get node uptime

* get mixnode reward estimation

* calculate saturation

calculate stake saturation

* Make ComputeRewardEstParam derive Debug

* set active set to be always true

Co-authored-by: Jon Häggblad <jon.haggblad@gmail.com>

Co-authored-by: Jon Häggblad <jon.haggblad@gmail.com>