feat(builder): cancel transaction when replacement underpriced

[dancoombs]

Closes #550

Proposed Changes

• Define bundle abandonment as - there is a pending bundle but after fee increases there are no longer any high enough paying UOs to increase the fees.
• Modify sender state machine to funnel every bundle abandonment to the same state - "replacement underpriced." That is, when a bundle is abandoned clear the transaction tracker and start from scratch. On networks where the previous txn may still be in the mempool, we will get a "replacement underpriced." On other networks, starting from scratch allows us to continue.
• Handle "replacement underpriced" errors with cancellations.
• For the flashbots sender, use a "soft cancellation", which is just an API call and doesn't require polling
• For all other senders, use a "hard cancellation", which requires a transaction to be sent to clear the mempool.

TODO (in follow up PRs):

• Consider splitting the monolith state machine function to make it easier to grok.
• Consider delaying moving to the cancellation state by counting the number of "replacement underpriced" errors without landing a bundle. This will reduce the amount of wasted cancellation funds at the expense of being less reactive.
• Unit testing of bundle_sender

[codecov]

Codecov Report

Attention: Patch coverage is 1.39721% with 494 lines in your changes missing coverage. Please review.

Project coverage is 54.37%. Comparing base (7ae5087) to head (43fa7ad).

Additional details and impacted files

Files	Coverage Δ
crates/builder/src/bundle_proposer.rs	89.11% <100.00%> (+0.03%)	⬆️
crates/builder/src/server/local.rs	0.00% <ø> (ø)
crates/builder/src/sender/mod.rs	1.06% <0.00%> (-0.21%)	⬇️
crates/builder/src/sender/bloxroute.rs	0.00% <0.00%> (ø)
crates/builder/src/sender/conditional.rs	0.00% <0.00%> (ø)
crates/builder/src/sender/raw.rs	0.00% <0.00%> (ø)
crates/builder/src/transaction_tracker.rs	79.56% <0.00%> (-9.39%)	⬇️
crates/builder/src/sender/flashbots.rs	0.00% <0.00%> (ø)
crates/builder/src/bundle_sender.rs	0.00% <0.00%> (ø)

Flag	Coverage Δ
unit-tests	54.37% <1.39%> (-0.68%)	⬇️

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

Components	Coverage Δ
rundler binary	0.00% <ø> (ø)
builder	45.75% <1.39%> (-3.28%)	⬇️
dev	0.00% <ø> (ø)
pool	64.37% <ø> (ø)
provider	16.68% <ø> (ø)
rpc	25.67% <ø> (ø)
sim	77.86% <ø> (ø)
tasks	∅ <ø> (∅)
types	65.45% <ø> (ø)
utils	18.28% <ø> (ø)