refactor: normalise ClientService#broadcast response

[faustbrian]

Resolves #126
Resolves #177

This introduces a normalised structure for transaction broadcasting responses but the error handling still needs improving on a per coin basis due to how most coins return failures as plain text instead of using error or status codes.

[codecov]

Codecov Report

Merging #165 into master will decrease coverage by 2.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
- Coverage   80.72%   78.62%   -2.11%     
==========================================
  Files          26       26              
  Lines         664      725      +61     
  Branches       69       93      +24     
==========================================
+ Hits          536      570      +34     
- Misses        126      154      +28     
+ Partials        2        1       -1     

Impacted Files	Coverage Δ
src/dto/transaction.ts	67.85% <0.00%> (-28.58%)	⬇️
src/services/client.ts	72.29% <0.00%> (-1.83%)	⬇️
src/services/tracker.ts	81.42% <0.00%> (-1.43%)	⬇️
src/services/identity/utils.ts	100.00% <0.00%> (ø)
src/services/transaction.ts	59.20% <0.00%> (+0.46%)	⬆️

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