v0.1.6 of scout_flutter

Zero-config OpenTelemetry RUM for Flutter. Auto-captures taps, navigation, errors, lifecycle, crashes, performance metrics, network requests, and structured logs. Changelog excerpt: ### Changes - sessionSampleRatedefault changed from 100.0to 1.0(1% of sessions) - New alwaysCaptureErrorsflag (default true) — errors and crashes (error, native_crash, app_crash, anr, ui_hang) bypass sessionSampleRateand are always exported - Sampling now enforced at the OpenTelemetry layer via a custom Sampler, so it also applies to spans from auto-instrumentation and direct tracer.startSpancalls - New debugLoggingflag (default false) — emits per-event [scout]di[...]