feat(xlm): implement MessageService

[faustbrian]

No description provided.

[codecov]

Codecov Report

Merging #214 into master will decrease coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
- Coverage   81.71%   81.56%   -0.15%     
==========================================
  Files          26       26              
  Lines         760      743      -17     
  Branches      101       92       -9     
==========================================
- Hits          621      606      -15     
+ Misses        137      136       -1     
+ Partials        2        1       -1     

Impacted Files	Coverage Δ
src/services/client.ts	83.89% <0.00%> (-1.73%)	⬇️
src/services/transaction.ts	59.20% <0.00%> (-0.80%)	⬇️
src/dto/transaction.ts	90.24% <0.00%> (-0.46%)	⬇️
src/services/identity/keys.ts	85.00% <0.00%> (+4.04%)	⬆️

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