feat(lsk): implement LedgerService

[faustbrian]

Resolves #205

Missing fixtures to make use of the replayer.

[codecov]

Codecov Report

Merging #240 into master will decrease coverage by 1.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #240      +/-   ##
==========================================
- Coverage   83.42%   82.40%   -1.02%     
==========================================
  Files          26       26              
  Lines         754      739      -15     
  Branches       92       88       -4     
==========================================
- Hits          629      609      -20     
- Misses        122      127       +5     
  Partials        3        3              

Impacted Files	Coverage Δ
src/services/identity/address.ts	80.95% <0.00%> (-4.77%)	⬇️
src/services/transaction.ts	57.72% <0.00%> (-3.82%)	⬇️
src/services/client.ts	84.61% <0.00%> (-2.06%)	⬇️
src/services/message.ts	95.65% <0.00%> (-0.19%)	⬇️

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[faustbrian]

#251