Add option to submit blocks only with bundles

[adrianchifor]

Adding an extra option on miner so we can skip building blocks to relays if they don't include any bundles. Mempool-only blocks with naive algos like greedy or mev-geth are not competitive enough to get bought in the majority of cases, and they can become spammy on relays if more people start running builders.

--miner.only_bundle_blocks     (default: false)
          Build only blocks with bundles

cc @avalonche @Ruteri

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• I have seen and agree to CONTRIBUTING.md

[Ruteri]

If the flag were on the miner config, you could avoid all the computation as you already know you can't build a block as soon as txpool.MevBundles call. I think it's worth it, as we anyway have builder-specific miner flags. what do you think?

[adrianchifor]

If the flag were on the miner config, you could avoid all the computation as you already know you can't build a block as soon as txpool.MevBundles call. I think it's worth it, as we anyway have builder-specific miner flags. what do you think?

Nice good point, updated to miner.

[Ruteri]

Make sure to cover all places where MevBundles is called (one more fillTransactionsAlgoWorker or something).