Support OpeningHoursSpecification structured data for creating OpeningHours

[ambroisemaupate]

• Adds OpeningHoursSpecificationParser final class with its unit-test
• Adds OpeningHours::createFromStructuredData method.

Fixes #231

[codecov-commenter]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (8ef0d60) 99.52% compared to head (ab33c74) 97.71%.

❗ Current head ab33c74 differs from pull request most recent head aa8f3b9. Consider uploading reports for the commit aa8f3b9 to get more accurate results

Files	Patch %	Lines
src/OpeningHoursSpecificationParser.php	79.76%	17 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #232      +/-   ##
============================================
- Coverage     99.52%   97.71%   -1.81%     
- Complexity      355      388      +33     
============================================
  Files            25       26       +1     
  Lines           834      921      +87     
============================================
+ Hits            830      900      +70     
- Misses            4       21      +17     

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