feat: tx-template api

[r4mmer]

Acceptance Criteria

• Create an API to send transactions from a tx-template
• Create an API to build transactions from a tx-template

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

Attention: Patch coverage is 33.89831% with 39 lines in your changes missing coverage. Please review.

Project coverage is 86.74%. Comparing base (1d1c899) to head (1e27f26).

Files with missing lines	Patch %	Lines
...llers/wallet/tx-template/tx-template.controller.js	17.50%	28 Missing and 5 partials ⚠️
src/helpers/validations.helper.js	14.28%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #518      +/-   ##
==========================================
- Coverage   90.19%   86.74%   -3.45%     
==========================================
  Files          54       56       +2     
  Lines        2325     2384      +59     
  Branches      439      444       +5     
==========================================
- Hits         2097     2068      -29     
- Misses        211      286      +75     
- Partials       17       30      +13     

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