chore: Update sdk_metadata features

[devin-ai-integration]

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 with no code changes.

Related issues

None

Describe the solution you've provided

This PR adds a features object to .sdk_metadata.json documenting all features supported by the Rust Server SDK and their introduction versions. Features were identified by cross-referencing:

• The SDK features documentation table from ld-docs-private
• The CHANGELOG.md in this repository
• The feature_info.json canonical keys from sdk-meta

18 features are documented with their introduction versions, listed alphabetically.

Items for reviewer attention

1. storingData/storingDataRedis: The documentation table shows "Storing data" as empty for Rust, but the CHANGELOG (1.0.0-beta.3) mentions "Add support for persistent data stores" and there's a separate rust-server-sdk-redis repo. Please verify both features should be included.

2. relayProxyDaemon at 2.5: The documentation table shows this as empty for Rust, but the CHANGELOG confirms "Add support for daemon mode" was added in 2.5.0.

3. inlineContextEvaluationEvents at 2.1: The documentation only shows inlineContextCustomEvents, but the CHANGELOG shows "Inline contexts for all evaluation events" was added in 2.1.0.

Additional context

Link to Devin run: https://app.devin.ai/sessions/527a5cc136ed4ce8b3cf2ab240600bd8
Requested by: @keelerm84

[devin-ai-integration]

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