chore: Update sdk_metadata features

[jsonbailey]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

N/A - This is a metadata-only change that doesn't affect SDK functionality.

Related issues

None

Describe the solution you've provided

This PR adds a features object to .sdk_metadata.json documenting all SDK features and their introduction versions. The feature list was compiled from:

• SDK features documentation (server-side SDKs L-Z table, Python column)
• feature_info.json for canonical feature keys
• CHANGELOG.md for version verification

29 features are documented including core features (contexts, experimentation, hooks), data storage options (Redis, Consul, DynamoDB), and newer capabilities (fdv2, pluginSupport, eventCompression).

Human review checklist

• Verify version numbers are accurate, particularly for recent features (9.x versions)
• Confirm inlineContextFeatureEvents at 9.10 is correct (CHANGELOG shows 9.3 for evaluation events, 9.10 for custom events)
• Check if any features are missing from the list

Describe alternatives you've considered

N/A

Additional context

• Link to Devin run: https://app.devin.ai/sessions/32cd834207084a02b103977c5200149d
• Requested by: @jsonbailey

---

Note

Documents Python Server SDK feature support in .sdk_metadata.json.

• Adds features map under python-server-sdk, listing 29 feature flags (e.g., contexts, hooks, eventCompression, storage backends) with their introduced versions
• No runtime or API changes; metadata-only update

^{Written by Cursor Bugbot for commit 5a59de9. This will update automatically on new commits. Configure here.}

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