Deprecating Span Events API

OpenTelemetry is deprecating the Span Events API in favor of using the Logs API for all events, aiming to simplify event handling and reduce inconsistency within the ecosystem. While new code should utilize log-based events correlated with spans, existing span events and views will continue to be supported through a compatibility layer – this is a deprecation of how events are recorded, not a removal of event visibility. The transition will be gradual, with guidance provided for operators, developers, and instrumentation authors to ensure a smooth shift towards the unified Logs API approach.