Upgrade to Corvus.JsonSchema 4

[dalyIsaac]

• Upgraded dependencies to their latest version
• Upgraded to Corvus.Json 4
• Switched to using a source generator for the schema parser/validator

Copilot reviewed 14 out of 14 changed files in this pull request and generated no suggestions.

[codecov]

Codecov Report

Attention: Patch coverage is 96.15385% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.74%. Comparing base (275b519) to head (32cc08b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Whim.Yaml/YamlBarPluginLoader.cs	92.59%	0 Missing and 2 partials ⚠️
src/Whim.Yaml/YamlPluginLoader.cs	97.14%	0 Missing and 2 partials ⚠️
src/Whim.Yaml/YamlLoaderUtils.cs	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1081      +/-   ##
==========================================
+ Coverage   80.66%   80.74%   +0.08%     
==========================================
  Files         284      284              
  Lines       12865    12898      +33     
  Branches     1483     1491       +8     
==========================================
+ Hits        10378    10415      +37     
+ Misses       2292     2290       -2     
+ Partials      195      193       -2     

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