Enforce base fee

[jbearer]

• Add logic in validate_proposal to enforce that the provided fee is at least the base fee
• Enable base fees in the demo, enforcing in the sequencers and configuring the builder to pay the base fee
• Deploy bridge contract before starting sequencers, read deposits from here
• Add a tool to work with the bridge, use this to fund the builder instead of prefunded accounts

The new demo configuration should work on a real network like Sepolia or Ethereum, and demonstrates the startup order/dependencies.

Draft because I think this should go in after the latest builder and HotShot updates, but I don't know how to do those updates.

[move47]

I think this can go first and later we can update with hotshot 0.5.45(needs to release tag) which will have simplify builder interaction, and update builder along with that.

[jbearer]

We need to wait until @Ancient123 is ready for the new contracts deployment order