Add OGGraph.outputValue API

[Kyle-Ye]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 23.89%. Comparing base (c952860) to head (e73aee7).

Files	Patch %	Lines
Sources/OpenGraph/Attribute/Rule/Rule.swift	0.00%	4 Missing ⚠️
Sources/OpenGraph/Attribute/Rule/RuleContext.swift	0.00%	4 Missing ⚠️
...ources/OpenGraph/Attribute/Rule/StatefulRule.swift	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #66   +/-   ##
=======================================
  Coverage   23.89%   23.89%           
=======================================
  Files          50       50           
  Lines        1264     1264           
=======================================
  Hits          302      302           
  Misses        962      962           

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