feat(core-api): add /transactions/schemas endpoint

[spkjp]

Summary

Checklist

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

[codecov]

Codecov Report

Merging #3083 into develop will increase coverage by 36.02%.
The diff coverage is 8.33%.

@@             Coverage Diff              @@
##           develop    #3083       +/-   ##
============================================
+ Coverage    29.64%   65.67%   +36.02%     
============================================
  Files          425      425               
  Lines        11755    11767       +12     
  Branches      1608     1609        +1     
============================================
+ Hits          3485     7728     +4243     
+ Misses        8239     4004     -4235     
- Partials        31       35        +4

Impacted Files	Coverage Δ
...s/core-api/src/handlers/transactions/controller.ts	70.76% <0%> (-14.42%)	⬇️
...kages/core-api/src/handlers/transactions/routes.ts	100% <100%> (ø)	⬆️
packages/crypto/src/utils/base58.ts	100% <0%> (+7.14%)	⬆️
...ckages/core-transaction-pool/src/wallet-manager.ts	100% <0%> (+8%)	⬆️
...ckages/core-transactions/src/transaction-reader.ts	8.33% <0%> (+8.33%)	⬆️
packages/crypto/src/transactions/types/factory.ts	100% <0%> (+8.33%)	⬆️
packages/core-container/src/config/file-loader.ts	10.86% <0%> (+10.86%)	⬆️
packages/core-transaction-pool/src/manager.ts	100% <0%> (+11.11%)	⬆️
packages/crypto/src/transactions/utils.ts	93.75% <0%> (+12.5%)	⬆️
packages/core-utils/src/httpie.ts	12.9% <0%> (+12.9%)	⬆️
... and 191 more

---

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 3bcc8fa...e189c8d. Read the comment docs.