[2.x] Overhaul the blog post authors feature

[caendesilva]

Abstract

This pull request makes major improvements into the usability and design of the blog post author feature.

See the 1.x tie in at #1794. See also #1798

Roadmap

• Improve the author feature to allow more schema fields #1778
• Support setting authors in the YAML configuration  #1719
• Bring the authors into the kernel?
• Add getPosts method to get posts by the author

Changes

• Breaking: The hyde.authors config setting should now be keyed by the usernames
• Removed: The deprecated PostAuthor::getName() method is now removed (use $author->name)
• Feature: We now support setting authors in the YAML configuration! Fixes #1719
• Feature: Added a $author->getPosts() method to get all author's posts
• Feature: Authors now can also have custom biographies and social media links
• The PostAuthor class is now Arrayable and JsonSerializable
• The collection of site authors are now stored in the HydeKernel
• Authors can additionally be accessed through Hyde::authors()

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ebe55fb) to head (8f1134d).

Additional details and impacted files

@@             Coverage Diff             @@
##             2.x-dev     #1782   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity      1823      1832    +9     
===========================================
  Files            186       187    +1     
  Lines           4824      4849   +25     
===========================================
+ Hits            4824      4849   +25     

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