feat(mempool): Add TxTracker support for handling temporary rejections

[vladjdk]

Description

This PR adds the tracking of priority transactions via TxTracker, a local queue. This is populated by checking for temporary rejections (such as in the case of nonce gaps or underpriced tx), and adding it to the TxTracker if that is the case. This is a separate state and worker that runs in a goroutine and periodically (initially after 10s) reevaluates its contents. No longer valid txs are dropped, newly valid txs are queued, and the rest remain in the local queue.

If the home directory is configured and not blank, then the contents of the TxTracker are journaled and persisted to disk (by default in ~/.evmd/data/txpool/transactions.rlp). This is picked up between node restarts so that those local txs are not lost.

This PR also adds the 4 new fields (locals, no-locals, journal, rejournal) that is used by TxTracker to toml.go and server flags under evm.mempool. The configureEVMMempool/GetLegacyPoolConfig helpers have also been updated to make use of the toml and/or cli flag values.

Closes: #500

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Author Checklist

I have...

• tackled an existing issue or discussed with a team member
• left instructions on how to review the changes
• targeted the main branch

[vladjdk]

Could you add more information in the PR about the different effects of this PR? (i.e. new config that's available, the fact that we save a new file to disk, etc.)

[vladjdk]

Could we add a system and integration test for this as well?

[vladjdk]

I think we can also merge the logic in for #494 (comment) to make this fully functional.

[codecov]

Codecov Report

❌ Patch coverage is 52.97158% with 182 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.27%. Comparing base (381a354) to head (9c2e436).

Files with missing lines	Patch %	Lines
mempool/txpool/locals/journal.go	38.46%	44 Missing and 20 partials ⚠️
rpc/backend/call_tx.go	42.99%	44 Missing and 17 partials ⚠️
mempool/txpool/locals/tx_tracker.go	82.17%	11 Missing and 7 partials ⚠️
server/server_app_options.go	21.42%	7 Missing and 4 partials ⚠️
server/start.go	0.00%	11 Missing ⚠️
mempool/txpool/legacypool/legacypool.go	35.71%	7 Missing and 2 partials ⚠️
mempool/mempool.go	76.92%	3 Missing and 3 partials ⚠️
server/config/config.go	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #646      +/-   ##
==========================================
+ Coverage   65.19%   65.27%   +0.08%     
==========================================
  Files         317      320       +3     
  Lines       21612    21855     +243     
==========================================
+ Hits        14090    14266     +176     
- Misses       6358     6387      +29     
- Partials     1164     1202      +38     

Files with missing lines	Coverage Δ
mempool/txpool/locals/errors.go	100.00% <100.00%> (ø)
rpc/backend/sign_tx.go	66.66% <ø> (+10.41%)	⬆️
server/config/opendb.go	0.00% <ø> (ø)
server/flags/flags.go	0.00% <ø> (ø)
server/config/config.go	49.54% <33.33%> (+2.83%)	⬆️
mempool/mempool.go	75.40% <76.92%> (-0.89%)	⬇️
mempool/txpool/legacypool/legacypool.go	84.07% <35.71%> (+1.36%)	⬆️
server/server_app_options.go	52.12% <21.42%> (-5.38%)	⬇️
server/start.go	0.00% <0.00%> (ø)
mempool/txpool/locals/tx_tracker.go	82.17% <82.17%> (ø)
... and 2 more

... and 1 file with indirect coverage changes

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