Speed up FakeValues#toJavaNames

[snuyanzin]

Usage of array instead of StringBuilder speeds up more than 2 times
before

Benchmark                Mode  Cnt      Score     Error   Units
ToJavaName.toJavaName2  thrpt   10  21737.634 ± 552.641  ops/ms

after

Benchmark                Mode  Cnt      Score     Error   Units
ToJavaName.toJavaName   thrpt   10  57957.671 ± 783.179  ops/ms

[codecov-commenter]

Codecov Report

Merging #579 (1f648b2) into main (6930ebe) will increase coverage by 0.05%.
The diff coverage is 82.35%.

@@             Coverage Diff              @@
##               main     #579      +/-   ##
============================================
+ Coverage     92.43%   92.48%   +0.05%     
- Complexity     2427     2431       +4     
============================================
  Files           252      252              
  Lines          5090     5099       +9     
  Branches        556      560       +4     
============================================
+ Hits           4705     4716      +11     
+ Misses          250      249       -1     
+ Partials        135      134       -1     

Impacted Files	Coverage Δ
...rc/main/java/net/datafaker/service/FakeValues.java	82.72% <82.35%> (+0.54%)	⬆️
.../java/net/datafaker/service/FakeValuesService.java	86.30% <0.00%> (+0.20%)	⬆️
...ker/idnumbers/pt/br/IdNumberGeneratorPtBrUtil.java	96.29% <0.00%> (+3.70%)	⬆️

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