Monitor Validators Reward

[SHi-ON]

This could be looked as a feature request.

Tracking rewards received by the TON validators can be of much interest to the community. Personally I like to see a graph to show how much Toncoin has validators received in the recent election(s) rounds.

This feature would also bring more transparency to the community. Likewise, nominators, in future, would be encouraged to participate by having a clear understanding of the amount of yielded rewards.