feat: Identify hooks

[abelonogov-ld]

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• 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

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Note

Introduce identify hooks and integrate them into all identify flows with optional timeout handling, adding IdentifySeriesContext and extending the Hook protocol.

• Hooks:
  • Extend Hook with beforeIdentify/afterIdentify stages (default no-ops) and docs.
  • Add IdentifySeriesContext for identify hook context.
• LDClient:
  • Add hook execution for identify via LDClientIdentifyHook.swift (executeWithIdentifyHooks, _identifyHooked).
  • Route all identify(...) overloads through _identifyHooked; timeout variant now uses hook-aware path.
  • Make _identify(...) accessible for reuse (was private).
• Evaluations:
  • Minor refactor in evaluateWithHooks to early-exit with guard when no hooks.

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