Validator Rewards - Dynamically estimate MEV Share

[ckoopmann]

The MEV Share of the Validator Rewards is currently hard coded.
We could replace that with a dynamic calculation
Examples for such calculation elsewhere:

• https://transparency.flashbots.net/
• https://mevboost.pics/
  

[JustinDrake]

We have an internal DB (called the "MEV DB") with all the required data. Look for the value field of the block_production table. Niclas or Alex can provide access.

Having said that for now we approximately have 391581 ETH /486 day = 805 ETH/day of MEV. So we we can dynamically calculate the yield percentage from that assumption. Aggregate MEV is so predictable that we could even remove the word "estimate" once we have that logic.