fix(core-transaction-pool): create new wallet if not found

[spkjp]

Summary

If the database wallet manager doesn't know the wallet we have to create a new one.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #3086 into develop will decrease coverage by 0.01%.
The diff coverage is 37.5%.

@@             Coverage Diff             @@
##           develop    #3086      +/-   ##
===========================================
- Coverage    65.73%   65.72%   -0.02%     
===========================================
  Files          425      425              
  Lines        11792    11797       +5     
  Branches      1613     1615       +2     
===========================================
+ Hits          7752     7754       +2     
- Misses        4005     4008       +3     
  Partials        35       35

Impacted Files	Coverage Δ
packages/core-database/src/database-service.ts	26.46% <0%> (ø)	⬆️
...ages/core-state/src/wallets/temp-wallet-manager.ts	76.47% <50%> (-6.29%)	⬇️

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