📝 Summary

This work starts to implement #25, bundle sponsorship. It shows how you can catch the InvalidTransaction::LackOfFundForMaxFee error and parse it to grab the necessary information to attempt a bundle sponsorship.

I started this PR months ago but didn't carry it out because at the time reth had a bug and was returning the wrong information. I am no longer actively working on it as my priorities have changed, so I'd encourage someone else to pick it up from here.

The next steps for this work:

• Simulate sponsored bundles
• Evaluate if they are profitable to sponsor and handle the results of simulation
• Alter SimulatedOrder to include info about sponsorship if desirable
• Parse and handle sponsored bundles when filling orders (e.g. by inserting a sponsor tx with the right nonce)

But I haven't thought it out thoroughly!

💡 Motivation and Context

See #25, we might want this because it allows us to execute some transactions and make fees from them that we otherwise wouldn't be able to - thus leading to more valuable blocks.

✅ I have completed the following steps:

• Run make lint
• Run make test
• Added tests (if applicable)