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]

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Codecov Report

Attention: Patch coverage is 82.35294% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.48%. Comparing base (6930ebe) to head (1f648b2).
Report is 1152 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/main/java/net/datafaker/service/FakeValues.java	82.35%	0 Missing and 3 partials ⚠️

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Additional details and impacted files

@@             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     

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