docs: mark Logging as complete, Domains as in-progress in feature table

[typotter]

Summary

• Updates Logging status from ❌ to ⚠️ — LoggingHook and the Logger interface are merged, but PII filtering (feat: Add PII filtering controls to LoggingHook #221) and full logging docs (docs: Add comprehensive logging documentation #220) are still open
• Updates Domains status from ❌ to ⚠️ — domain binding is actively in development (feat: add Domains (formerly Clients) (#185) #231)
• Rewrites the Logging section with accurate current state and a working code example
• Rewrites the Domains section with a spec link and in-progress note

Test plan

• Verify LoggerFactory.getLogger and LoggingHook constructor signatures match the example
• Confirm the domains spec link resolves correctly

[gemini-code-assist]

Code Review

This pull request updates the README.md to reflect the current implementation status of Logging and Domains features. It introduces documentation for the LoggingHook and Logger interface, including a code example, and provides a link to the OpenFeature documentation for Domains. Feedback was provided to improve the technical accuracy of the LoggingHook description regarding its default logger behavior.