fix(builder): fix builder state machine replacement tracking

[dancoombs]

Implement a better tracking mechanism for state machine replacement underpriced tracking.

TODO:

• Unit tests for new tracking
• Update docs with state machine diagram and description

[codecov]

Codecov Report

Attention: Patch coverage is 58.98438% with 105 lines in your changes missing coverage. Please review.

Project coverage is 57.27%. Comparing base (e6c9f15) to head (7c9c85b).

Additional details and impacted files

Files	Coverage Δ
crates/pool/src/mempool/pool.rs	95.79% <94.11%> (-0.07%)	⬇️
crates/builder/src/task.rs	0.00% <0.00%> (ø)
bin/rundler/src/cli/builder.rs	0.00% <0.00%> (ø)
crates/builder/src/bundle_proposer.rs	90.29% <75.00%> (-0.08%)	⬇️
crates/builder/src/transaction_tracker.rs	79.17% <66.66%> (-2.00%)	⬇️
crates/builder/src/bundle_sender.rs	69.97% <52.86%> (-2.83%)	⬇️

Flag	Coverage Δ
unit-tests	57.27% <58.98%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
rundler binary	0.00% <0.00%> (ø)
builder	59.16% <57.44%> (-0.38%)	⬇️
dev	0.00% <ø> (ø)
pool	64.95% <94.11%> (-0.07%)	⬇️
provider	16.10% <ø> (ø)
rpc	25.64% <ø> (ø)
sim	78.25% <ø> (ø)
tasks	∅ <ø> (∅)
types	66.68% <ø> (ø)
utils	18.28% <ø> (ø)

[0xfourzerofour]

looks good just a nit