refactor(core-transaction-pool): better locking

[rainydio]

Summary

Follow-up to #3800

New general-purpose Lock class is added to core-kernel utils to facilitate pool synchronization:

• There are two kind of executions: exclusive and non-exclusive.
• Any number of non-exclusive executions can run in parallel.
• Only a single exclusive execution can run at a time.
• Non-exclusive execution waits for exclusive to finish before starting.
• Exclusive execution waits for both exclusive and non-exclusive to finish before starting.

In general this kind of locking is traditionally used in databases. Read-only transactions can run in parallel, write transactions require all read-only transactions to finish and then lock database until finished. Technique itself is more general and can be applied in non-database scenarios.

Several synchronization issues are fixed in pool:

• Pool service now correctly ignores errors that happen in another execution while waiting for lock.
• Sender mempool is now disposed only if it's empty and there are no pending operations waiting for lock.

Checklist

• Tests
• Ready to be merged

[codecov]

Codecov Report

Merging #3802 into develop will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #3802      +/-   ##
===========================================
+ Coverage    96.92%   97.09%   +0.16%     
===========================================
  Files          616      617       +1     
  Lines        13999    13955      -44     
  Branches      1688     1685       -3     
===========================================
- Hits         13569    13549      -20     
+ Misses         137      117      -20     
+ Partials       293      289       -4     

Flag	Coverage Δ
#functional	6.41% <0.00%> (+0.02%)	⬆️
#integration	10.13% <0.00%> (+0.03%)	⬆️
#unit	95.07% <100.00%> (+0.15%)	⬆️

Impacted Files	Coverage Δ
packages/core-transaction-pool/src/utils.ts	93.75% <ø> (-2.81%)	⬇️
packages/core-kernel/src/utils/lock.ts	100.00% <100.00%> (ø)
packages/core-transaction-pool/src/mempool.ts	97.67% <100.00%> (ø)
...ckages/core-transaction-pool/src/sender-mempool.ts	100.00% <100.00%> (ø)
packages/core-transaction-pool/src/service.ts	99.18% <100.00%> (+12.62%)	⬆️
...ges/core-p2p/src/socket-server/controllers/peer.ts	98.41% <0.00%> (+0.02%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 507f811...99fe584. Read the comment docs.