Refactor country-specific properties

[asolntsev]

Move country-specific properties from lang.yml to _COUNTRY.yml files.

These are settings that depend on country, not language (e.g. postal code, building numbers, passport numbers, internet domains).

The primary test showing the difference is AddressTest.usingOnlyCountryCodeWithoutLanguage().

For example,

assertThat(new Faker(new Locale("et", "AL")).address().countryCode()).isEqualTo("AL");
  // was: EE
  // now: AL

And:

assertThat(new Faker(new Locale("et", "BY")).address().postcode()).matches("\\d{6}");
  // was: <5 digits> (Estonian postal code)
  // now: <6 digits> (Belorussian postal code)

In this PR, I had to introduce concept of "language's default country".
In the case when only the language is given, we need to detect the country:

assertThat(new Faker(new Locale("et")).address().countryCode()).isEqualTo("EE"); // for Estonian language, we use Estonia settings by default
assertThat(new Faker(new Locale("hy")).address().countryCode()).isEqualTo("AM"); // for Armenian language, we use Armenia settings by default

The list of "language's default countries" is located in FakerContext.LANGUAGE_DEFAULT_COUNTRY.

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All modified and coverable lines are covered by tests ✅

Project coverage is 92.35%. Comparing base (ebac66a) to head (e0218e6).

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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1489      +/-   ##
============================================
- Coverage     92.45%   92.35%   -0.11%     
- Complexity     3255     3256       +1     
============================================
  Files           324      324              
  Lines          6387     6407      +20     
  Branches        623      623              
============================================
+ Hits           5905     5917      +12     
- Misses          336      339       +3     
- Partials        146      151       +5     

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