Improve hex string to data conversion performance

[alejandro-isaza]

No description provided.

[codecov-io]

Codecov Report

Merging #2 into master will increase coverage by 0.59%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master       #2      +/-   ##
==========================================
+ Coverage   75.95%   76.55%   +0.59%     
==========================================
  Files           8        8              
  Lines         391      401      +10     
  Branches        7        9       +2     
==========================================
+ Hits          297      307      +10     
  Misses         94       94

Impacted Files	Coverage Δ
Sources/DataHex.swift	70.49% <92.85%> (+5.78%)	⬆️

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