refactor: group repeated Buffer behaviours into a class

[faustbrian]

Resolves #215

[codecov]

Codecov Report

Merging #216 into master will increase coverage by 6.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
+ Coverage   75.27%   81.78%   +6.50%     
==========================================
  Files          26       26              
  Lines         639      763     +124     
  Branches       67      100      +33     
==========================================
+ Hits          481      624     +143     
+ Misses        155      137      -18     
+ Partials        3        2       -1     

Impacted Files	Coverage Δ
src/utils/hash.ts	45.45% <0.00%> (ø)
src/services/message.ts	95.83% <0.00%> (+0.18%)	⬆️
src/utils/crypto.ts	94.44% <0.00%> (+0.32%)	⬆️
src/dto/transaction.ts	90.69% <0.00%> (+0.69%)	⬆️
src/services/client.ts	85.62% <0.00%> (+3.18%)	⬆️
src/services/ledger.ts	36.84% <0.00%> (+3.50%)	⬆️
src/services/fee.ts	94.11% <0.00%> (+19.11%)	⬆️
src/services/transaction.ts	60.00% <0.00%> (+20.74%)	⬆️
src/services/identity/wif.ts	85.71% <0.00%> (+28.57%)	⬆️
src/services/peer.ts	96.10% <0.00%> (+74.67%)	⬆️

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