bloc_signals_otel 0.9.0

OpenTelemetry tracing instrumentation for BlocSignal.

0.9.0

• Staging release candidate for the 1.0.0 production milestone.
• Update bloc_signals dependency constraint to ^0.9.0.

0.2.4

• Initial release as bloc_signals_otel (formerly otel_bloc_signals).
• Aligned package name with bloc_signals_* monorepo package naming convention.
• OpenTelemetry tracing instrumentation for BlocSignal and CubitSignal.
• Cap active span maps and purge lingering spans on onClose disposal to prevent memory leaks during high-frequency error cascades.
• Route error exceptions directly to active event spans via identity hash-matching.
• Update bloc_signals dependency to ^0.2.8.