Add hostname and idn-hostname format validators

[OptimumCode]

Related to #54

[codecov]

Codecov Report

Attention: Patch coverage is 82.67898% with 75 lines in your changes are missing coverage. Please review.

Project coverage is 90.10%. Comparing base (8900520) to head (0549f41).

Files	Patch %	Lines
...ema/internal/formats/IdnHostnameFormatValidator.kt	76.44%	7 Missing and 42 partials ⚠️
...imumcode/json/schema/internal/hostname/Punycode.kt	87.19%	5 Missing and 16 partials ⚠️
...timumcode/json/schema/internal/util/UnicodeUtil.kt	81.48%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
- Coverage   91.43%   90.10%   -1.33%     
==========================================
  Files         104      108       +4     
  Lines        2358     2779     +421     
  Branches      604      778     +174     
==========================================
+ Hits         2156     2504     +348     
- Misses         36       48      +12     
- Partials      166      227      +61     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.