test(xrp): setup mock websocket server

[faustbrian]

Resolves #100

[codecov]

Codecov Report

Merging #190 into master will increase coverage by 3.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   78.18%   81.20%   +3.01%     
==========================================
  Files          26       24       -2     
  Lines         729      681      -48     
  Branches       93       79      -14     
==========================================
- Hits          570      553      -17     
+ Misses        158      127      -31     
  Partials        1        1              

Impacted Files	Coverage Δ
src/services/identity/address.ts	79.16% <0.00%> (-8.84%)	⬇️
src/services/identity/public-key.ts	81.25% <0.00%> (-8.75%)	⬇️
src/services/identity/private-key.ts	90.00% <0.00%> (-3.34%)	⬇️
src/services/message.ts	94.44% <0.00%> (-1.02%)	⬇️
src/services/transaction.ts	58.33% <0.00%> (-0.87%)	⬇️
src/utils/hash.ts
src/utils/crypto.ts
src/services/identity/keys.ts	88.88% <0.00%> (+3.88%)	⬆️
src/services/client.ts	85.91% <0.00%> (+13.61%)	⬆️
src/dto/transaction.ts	85.71% <0.00%> (+17.85%)	⬆️

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