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

Note: This is a metadata-only change that doesn't require test coverage or platform validation.

Related issues

N/A - This is a metadata update to document SDK features.

Describe the solution you've provided

This PR adds a features object to .sdk_metadata.json documenting all the features supported by the Ruby Server SDK and the version in which each was introduced. The feature list was derived from the SDK features documentation and uses canonical feature names from feature_info.json.

Features documented (25 total):

• allFlags, appMetadata, bigSegments, contexts, experimentation, fileDataSource, flagChanges, hooks, inlineContextCustomEvents, inlineContextEvaluationEvents, migrations, offlineMode, omitAnonContexts, otel, privateAttrs, relayProxyDaemon, relayProxyProxy, secureMode, storingData, storingDataConsul, storingDataDynamodb, storingDataRedis, testDataSource, track, variationDetail, webProxy

Describe alternatives you've considered

N/A

Additional context

• Feature keys use camelCase to match the canonical names in sdk-meta's feature_info.json
• The storing data sub-features (storingDataConsul, storingDataDynamodb, storingDataRedis) were added to sdk-meta in PR #328 (now merged)
• The schema was updated in PR #330 to allow optional patch versions (now merged)

Updates since last revision

• Renamed inlineContextFeatureEvents to inlineContextEvaluationEvents (8.3) to match updated sdk-meta naming
• Added inlineContextCustomEvents (8.9) as a separate feature for inline contexts in custom events
• Updated feature versions to include patch versions where the documentation specifies them:
  • allFlags: 2.0.1
  • fileDataSource: 5.4.1
  • secureMode: 2.0.1
  • storingData: 2.3.1
  • storingDataRedis: 2.3.1
  • webProxy: 2.2.5

Human review checklist

• Verify version numbers match the documentation table for Ruby SDK (5th column in "Server-side SDKs, L-Z" section)
• Verify feature key naming matches canonical names in sdk-meta's feature_info.json
• Confirm inlineContextEvaluationEvents (8.3) and inlineContextCustomEvents (8.9) match the updated sdk-meta feature names

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Requested by: @jsonbailey
Link to Devin run: https://app.devin.ai/sessions/49b44fe704ac4382802b7b3dc07970a6

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