feat: Support Traces, Logs, Metrics in mobile dotnet 0.5.0

[abelonogov-ld]

Summary

Summary: This PR adds distributed tracing support to the .NET MAUI and Android SDKs, refactors the plugin initialization architecture, expands the LDObserve public API with full Android implementation, and significantly improves the README documentation.

Architecture Overview

The tracing pipeline works as follows:

C# side: LDObserve.StartActiveSpan() creates .NET Activity objects via an OpenTelemetry TracerProvider (LDTracer singleton)
Export: LDTraceExporter catches completed spans and forwards them to TraceBuilderAdapter
Bridge: TraceBuilderAdapter calls the native tracer (iOS ObjcTracer / Android KotlinTracer) to re-create the span natively with the same trace/span/parent IDs and timestamps
Android ID mapping: Since OTel Java auto-generates new IDs, KotlinTracer stashes the C#-supplied IDs as __bridge.trace_id / __bridge.span_id attributes, and SamplingTraceExporter.applyBridgeIdOverrides() swaps them in before export

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Note

High Risk
Medium-to-high risk: introduces new cross-language tracing pipeline (OpenTelemetry exporter + native span recreation/ID overrides) and refactors plugin initialization and hook wiring across Android/iOS, which can affect telemetry correctness and startup sequencing.

Overview
Adds full Observability support to the .NET MAUI SDK: LDObserve now records logs/errors/metrics on Android as well as iOS, and introduces a new OpenTelemetry-based tracing path (LDTracer + LDTraceExporter) that forwards completed .NET spans to native tracers on iOS/Android.

Refactors native plugin startup and hook wiring: replaces NativePluginConnector with PluginOrchestrator, splits observability vs session-replay hook export (NativeObservabilityHookExporter / NativeSessionReplayHookExporter), and updates native bridges (new Android LDObserveBridgeAdapter, new Kotlin bridge package/classes, iOS binding additions) to expose hook proxies + tracer builders.

Updates packaging/docs/samples: bumps mobile-dotnet version to 0.5.0, adds OpenTelemetry and newer LaunchDarkly.ClientSdk deps, enables Android metrics by default, updates README from “Session Replay” to “Observability”, and expands the MAUI sample with new trace/log demos and a DialogsPage plus extra UI dependencies.

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