Feature: Add the ability to quantify block quality

[buffalu]

Is your feature request related to a problem? Please describe.
Some validators run misconfigured for long periods of time, producing only non-vote blocks. In a stake delegation strategy, this should be heavily penalized.

Describe the solution you'd like
Determine how to measure this and build it. For instance, it could be something like:

• number of blocks with <5 non-vote transactions.
• number of blocks with 0 non-vote transactions.
• ???