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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