feat: automatic transformation of record classes

[TimoGlastra]

Transform record classes and its sub objects using class transformer.

Fixes #106

Was sort of a blocker for some of the work I wanted to do for #187, and it was long overdue this was fixed.

[codecov-commenter]

Codecov Report

Merging #253 (a37351b) into main (36f957c) will decrease coverage by 0.09%.
The diff coverage is 97.26%.

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
- Coverage   89.00%   88.90%   -0.10%     
==========================================
  Files         177      177              
  Lines        3364     3362       -2     
  Branches      387      387              
==========================================
- Hits         2994     2989       -5     
- Misses        367      373       +6     
+ Partials        3        0       -3     

Impacted Files	Coverage Δ
src/index.ts	100.00% <ø> (ø)
src/modules/ledger/services/LedgerService.ts	83.18% <80.00%> (-1.36%)	⬇️
.../modules/credentials/services/CredentialService.ts	85.56% <83.33%> (+0.13%)	⬆️
src/storage/BaseRecord.ts	90.00% <88.88%> (-10.00%)	⬇️
src/agent/Agent.ts	100.00% <100.00%> (ø)
src/agent/BaseMessage.ts	100.00% <100.00%> (ø)
src/decorators/attachment/Attachment.ts	100.00% <100.00%> (ø)
...es/basic-messages/repository/BasicMessageRecord.ts	100.00% <100.00%> (ø)
src/modules/connections/models/ConnectionRole.ts	100.00% <100.00%> (ø)
...modules/connections/repository/ConnectionRecord.ts	96.42% <100.00%> (-0.76%)	⬇️
... and 11 more

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[jakubkoci]

This is great we finally have it align. So pleasure to review this and see how we're getting rid of those ugly conditional transformations 😄