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## Problem The page service logic asserts that a tracing span is present with tenant/timeline/shard IDs. An initial gRPC page service implementation thus requires a tracing span. Touches https://github.com/neondatabase/neon/issues/11728. ## Summary of changes Adds an `ObservabilityLayer` middleware that generates a tracing span and decorates it with IDs from the gRPC metadata. This is a minimal implementation to address the tracing span assertion. It will be extended with additional observability in later PRs.