feat: Implement Redis storage

[konstantinabl]

Description

This PR implements RedisPendingTransactionStorage, a Redis-backed storage for the transaction pool

Uses Redis Sets per address (pending:

) to store unique transaction hashes with natural deduplication via SADD.

Related issue(s)

Fixes #4390

Changes from original design (optional)

It was decided LUA scripts are not needed for the simple operations of addition, removal and length check we use, since they are atomic anyways

Checklist

• I've assigned an assignee to this PR and related issue(s) (if applicable)
• I've assigned a label to this PR and related issue(s) (if applicable)
• I've assigned a milestone to this PR and related issue(s) (if applicable)
• I've updated documentation (code comments, README, etc. if applicable)
• I've done sufficient testing (unit, integration, etc.)

[github-actions]

Test Results

 20 files  ±0  265 suites  ±0   35m 16s ⏱️ + 7m 33s
761 tests ±0  753 ✅  - 2  5 💤 ±0  3 ❌ +2 
777 runs  ±0  769 ✅  - 2  5 💤 ±0  3 ❌ +2 

For more details on these failures, see this check.

Results for commit bfe4d8d. ± Comparison against base commit 256d146.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 95.91837% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ctionPoolService/RedisPendingTransactionStorage.ts	95.91%	4 Missing ⚠️

@@                   Coverage Diff                    @@
##             feat/transaction-pool    #4438   +/-   ##
========================================================
  Coverage                         ?   95.83%           
========================================================
  Files                            ?      124           
  Lines                            ?    20206           
  Branches                         ?     1757           
========================================================
  Hits                             ?    19365           
  Misses                           ?      819           
  Partials                         ?       22           

Flag	Coverage Δ
config-service	98.80% <ø> (?)
relay	90.85% <95.91%> (?)
server	88.82% <ø> (?)
ws-server	98.27% <ø> (?)

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

Files with missing lines	Coverage Δ
...ctionPoolService/RedisPendingTransactionStorage.ts	95.91% <95.91%> (ø)

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