duty_executor: figure out which blocks are newly finalized

[prajwolrg]

Resolves #90

[delbonis]

Looks pretty good, just the weird thing that would be nice to clean up. If it's too much trouble to change I think it can be merged.

[codecov]

Codecov Report

Attention: Patch coverage is 80.98160% with 31 lines in your changes missing coverage. Please review.

Project coverage is 53.85%. Comparing base (350f4df) to head (c76e73d).

Files	Patch %	Lines
crates/consensus-logic/src/duty_executor.rs	81.81%	16 Missing ⚠️
crates/consensus-logic/src/duties.rs	0.00%	15 Missing ⚠️

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   53.62%   53.85%   +0.23%     
==========================================
  Files          86       86              
  Lines        7596     7687      +91     
==========================================
+ Hits         4073     4140      +67     
- Misses       3523     3547      +24     

Files	Coverage Δ
crates/consensus-logic/src/unfinalized_tracker.rs	94.90% <100.00%> (-0.62%)	⬇️
crates/test-utils/src/l2.rs	98.66% <100.00%> (+1.69%)	⬆️
crates/consensus-logic/src/duties.rs	0.00% <0.00%> (ø)
crates/consensus-logic/src/duty_executor.rs	22.29% <81.81%> (+22.29%)	⬆️

... and 4 files with indirect coverage changes

[delbonis]

Some minor cleanup but otherwise looks good I think. I'll DM about the bookkeeping I mentioned in the previous review.

[delbonis]

Looks good, I didn't think that would be this clean.