Flag to filter out builder profit

[terencechain]

We can add a CLI flag to filter out builder blocks based on builder profit (ex: --builder-profit-threshold <wei value> ). If the builder's bid is below the threshold value then we default to using the local execution engine. Unfortunately, the local block's value can't be retrieved nor compared at this moment until engine-API support. Credit to @realbigsean for this idea

[realbigsean]

Thanks for the shoutout @terencechain but I have to deflect the credit to @allboxes who raised an issue in our repo!