chore: Update sdk_metadata features

[devin-ai-integration]

Requirements

• I have added test coverage for new or changed functionality — N/A, metadata-only change
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions — N/A, metadata-only change

Related issues

Part of a cross-repo effort to populate the features field in .sdk_metadata.json for all LaunchDarkly SDKs.

Describe the solution you've provided

Adds a features map to the swift-client-sdk entry in .sdk_metadata.json, documenting which SDK features are supported and the version each was introduced. Feature keys use the canonical camelCase names from sdk-meta/products/feature_info.json, and introduction versions are sourced from the SDK features documentation table ("all other client-side SDKs" → iOS column) and verified against the repository's CHANGELOG.

17 features included (alphabetical): allFlags, appMetadata, autoEnvAttrs, bigSegments, contexts, eventCompression, experimentation, flagChanges, hooks, inlineContextCustomEvents, multiEnv, offlineMode, pluginSupport, privateAttrs, relayProxyProxy, track, variationDetail.

Updates since last revision

Corrected two version numbers and added one new feature, all verified against CHANGELOG.md:

• appMetadata: 8.0 → 6.2.0 — confirmed via CHANGELOG entry "Introduced ApplicationInfo, for configuration of application metadata" under ## [6.2.0]
• multiEnv: 5.3.1 → 5.0 — confirmed via CHANGELOG entry "Support for multiple LaunchDarkly projects or environments" under ## [5.0.1] (which includes the 5.0.0 release notes). Note: multiEnv was also present in the Obj-C era at 2.14.0, but 5.0 was chosen as the Swift SDK rewrite version per reviewer guidance.
• eventCompression: added at 9.9.0 — confirmed via CHANGELOG entry "Add option to enable compression of event payloads" under ## [9.9.0]

Human review checklist

• Verify appMetadata: "6.2.0" — changed from the docs table value of 8.0. The CHANGELOG clearly shows ApplicationInfo was introduced in 6.2.0. The 7.0.0 entry later added "Objective C bindings for ApplicationInfo", which may explain why the docs table listed 8.0. Confirm 6.2.0 is correct.
• Verify multiEnv: "5.0" — changed from 5.3.1. The CHANGELOG shows multi-environment support was added in 5.0.0/5.0.1 (and earlier in 2.14.0 for Obj-C). Confirm 5.0 is the preferred version.
• Verify eventCompression: "9.9.0" — new feature added. Confirm eventCompression is the correct canonical feature key.
• Spot-check other introduction versions against CHANGELOG (e.g., hooks: "9.7.2", inlineContextCustomEvents: "9.13", pluginSupport: "9.14")
• bigSegments: "1.0" represents the docs value "All" (i.e., supported since first stable release). The repo has beta tags back to 0.1.0-beta, but 1.0 was used as the first stable version — confirm this is acceptable
• pluginSupport: "9.14" is mapped from the "Observability plugin" row in the docs table — verify this is the correct feature key for this SDK
• Confirm no supported features are missing — the docs table shows empty cells for bootstrapping, migrations, fileDataSource, testDataSource, secureMode, storingData, webProxy, omitAnonContexts, and otel

Describe alternatives you've considered

N/A — follows the established pattern from other SDKs (e.g., js-core, go-server-sdk).

Additional context

• Link to Devin session
• Requested by: Aaron Zeisler

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