Return supported locales

[snuyanzin]

Descrease number of exceptions in case of empty filename
Make it returning supported locales both for jars and source
Also there is support for custom locales added via custom providers
e.g.

faker.locality().allSupportedLocales(Set.of("datafaker", "custom jar"));

in args need to pass jar names to look at

should fix #566

[codecov-commenter]

Codecov Report

Merging #589 (5a6c12c) into main (8ce9e40) will decrease coverage by 0.30%.
The diff coverage is 45.71%.

@@             Coverage Diff              @@
##               main     #589      +/-   ##
============================================
- Coverage     93.50%   93.20%   -0.31%     
- Complexity     2441     2442       +1     
============================================
  Files           252      252              
  Lines          5053     5075      +22     
  Branches        551      558       +7     
============================================
+ Hits           4725     4730       +5     
- Misses          193      208      +15     
- Partials        135      137       +2     

Impacted Files	Coverage Δ
...n/java/net/datafaker/providers/base/BaseFaker.java	94.04% <ø> (ø)
...in/java/net/datafaker/providers/base/Locality.java	64.81% <45.71%> (-32.07%)	⬇️
...rc/main/java/net/datafaker/service/FakeValues.java	82.14% <0.00%> (-0.90%)	⬇️
.../datafaker/transformations/sql/SqlTransformer.java	88.19% <0.00%> (+0.73%)	⬆️

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[snuyanzin]

probably need to debug a bit windows version