Introduce FakeValuesContext and FAKE_VALUES_MAP

[snuyanzin]

The idea behind this PR is to init FakeValues only once per FakeValuesContext (determined by locale, path, url, filename),
right now it generates new FakeValues each time if it is not a default locale

It will allow to reduce GC/memory cost.

Also it was mentioned at #759 at these comments #759 (comment) and #759 (comment)

The best benchmark illustrating improvement is time consumed for build (since junit5 tests in datafaker are running in concurrent mode)
e.g. here for this PR for ubuntu jdk17 it took 1 min, 0 sec[1] vs 1min 18 sec for the latest main[2]
same for jdk20 this PR [3] took 57 sec vs 1 min 14 sec for the latest main [4]
also locally mvn clean verify is about 10-15% faster

[1] https://github.com/datafaker-net/datafaker/actions/runs/4707215086/jobs/8348951734?pr=767#step:4:966
[2] https://github.com/datafaker-net/datafaker/actions/runs/4700592603/jobs/8335491257#step:4:967
[3] https://github.com/datafaker-net/datafaker/actions/runs/4707215086/jobs/8348951927?pr=767#step:4:970
[4] https://github.com/datafaker-net/datafaker/actions/runs/4700592603/jobs/8335491891#step:4:969

[codecov-commenter]

Codecov Report

Merging #767 (e7fc6c0) into main (e64dfa8) will increase coverage by 0.07%.
The diff coverage is 87.50%.

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@@             Coverage Diff              @@
##               main     #767      +/-   ##
============================================
+ Coverage     92.77%   92.84%   +0.07%     
- Complexity     2604     2633      +29     
============================================
  Files           282      284       +2     
  Lines          5161     5202      +41     
  Branches        533      537       +4     
============================================
+ Hits           4788     4830      +42     
+ Misses          245      244       -1     
  Partials        128      128              

Impacted Files	Coverage Δ
.../java/net/datafaker/service/FakeValuesContext.java	85.29% <85.29%> (ø)
...rc/main/java/net/datafaker/service/FakeValues.java	83.76% <88.88%> (+2.61%)	⬆️
...java/net/datafaker/service/FakeValuesGrouping.java	91.30% <100.00%> (ø)
.../java/net/datafaker/service/FakeValuesService.java	83.97% <100.00%> (ø)

... and 6 files with indirect coverage changes

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