refactor(transaction-pool-service): move wallet from state to transaction-pool-service

[sebastijankuzner]

Summary

Checklist

• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.60%. Comparing base (604fb55) to head (4f0d7e9).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1519      +/-   ##
===========================================
+ Coverage    80.31%   80.60%   +0.28%     
===========================================
  Files          953      963      +10     
  Lines        17163    17597     +434     
  Branches      2599     2675      +76     
===========================================
+ Hits         13785    14184     +399     
- Misses        3373     3405      +32     
- Partials         5        8       +3     

Flag	Coverage Δ
contracts	91.95% <ø> (?)
packages	80.31% <ø> (-0.01%)	⬇️

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