Use cast to char instead of Math.abs, use value of first symbols for hashcode

[snuyanzin]

A bit more speed up for net.datafaker.providers.base.Text#text(net.datafaker.providers.base.Text.TextRuleConfig)
before

Benchmark                        Mode  Cnt     Score     Error   Units
DatafakerSimpleMethods.text10   thrpt   10  4360.216 ± 529.892  ops/ms
DatafakerSimpleMethods.text100  thrpt   10   895.668 ±  98.985  ops/ms

after

Benchmark                        Mode  Cnt     Score      Error   Units
DatafakerSimpleMethods.text10   thrpt   10  4997.986 ± 1148.652  ops/ms
DatafakerSimpleMethods.text100  thrpt   10  1168.288 ±  155.656  ops/ms

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.93%. Comparing base (fd8e32b) to head (e17aed9).
Report is 1198 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/main/java/net/datafaker/providers/base/Text.java	83.33%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #531      +/-   ##
============================================
+ Coverage     91.87%   91.93%   +0.06%     
- Complexity     2358     2360       +2     
============================================
  Files           247      247              
  Lines          4947     4947              
  Branches        530      530              
============================================
+ Hits           4545     4548       +3     
+ Misses          273      268       -5     
- Partials        129      131       +2     

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