Pass the finalized state to chain contextual validation

[teor2345]

Motivation

To check for missing UTXOs, we need to have the block, non-finalized chain, and finalized chain UTXOs.
The only place we have all the right data is just before we commit a block to a non-finalized chain.

So we need to pass the finalized state to this method.

Solution

• Pass the finalized state to chain contextual validation
• Add a new method for chain contextual validation, so we can handle errors correctly

This PR is part of #2231, but it doesn't close that ticket.

Review

This change will impact work that @conradoplg and @oxarbitrage are doing right now, so they should both review it.

We should try to get it merged soon, so we can avoid conflicts with that work.

Reviewer Checklist

• Code implements Specs and Designs

This code has existing tests, and the finalized state will be tested as part of the transparent double spend checks in #2231.

[conradoplg]

Great idea! Passing the whole finalized state and making both commit_block and commit_new_chain call the same function will make everything else much simpler.