feat: Bridging hooks calls from MAUI

[abelonogov-ld]

• Expose hooks for MAUI
• Fix sending internal traces through Customer API

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Note

Medium Risk
Changes hook/span lifecycle handling and tracing client plumbing, and introduces new thread-safe caching structures; mistakes could cause missing/duplicated spans or incorrect telemetry attributes.

Overview
Adds MAUI hook bridging by introducing ObservabilityHookProxy (stored on LDObserve.shared) and a shared ObservabilityHookExporter used by both the native Swift ObservabilityHook and the MAUI bridge.

Refactors evaluation tracing to track in-flight spans by evaluationId (via new FIFO-evicting BoundedMap) and centralizes span start/end + attribute/event emission in the exporter; InternalObserve/ObservabilityService now expose traceClient for this path.

Improves cross-boundary value passing with LDValue↔Foundation (NSObject/NSDictionary/NSArray) conversion helpers, and extends AtomicDictionary with synchronous barrier setValue/removeValue; adds unit tests for BoundedMap and LDValue conversions.

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