Name resolution delay#12893
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This commit implements the plumbing required to propagate delay reason tokens from load balancing policies up to the transport layer and tracers, as specified in the LB policy delay design.
…dence invariants - Refactor ClientStreamTracer to expose delayTypeStarted(String) and delayReasonAttached(String) - Enhance PickResult with separate delayType and delayReason diagnostic fields - Implement Mark Roth's hybrid telemetry cadence model in DelayedClientTransport.PendingStream - Support channel fallback delay states (client_channel_init, subchannel_state_mismatch, wait_for_ready_failed) - Simplify leaf and container LB policies to emit canonical unified connecting metric labels
# Conflicts: # core/src/main/java/io/grpc/internal/PickFirstLeafLoadBalancer.java
… in OpenTelemetry modules
…ay and Attempt-Level Delay
…for name resolution in ManagedChannelImpl
…name-resolution-delay branch
…ame-resolution-delay branch
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To be raised after lb-policy-delay gets merged