Address feedback on gRPC multiple StatsHandler support

[Copilot]

Clarifies that gRPC now supports multiple StatsHandlers natively - all registered handlers are invoked, not just the last one.

Context

The bot reviewer flagged the loop registering multiple stats handlers in grpc/application.go:161-166, claiming only the last handler would take effect. This was based on outdated gRPC behavior.

Resolution

No code changes required. Modern gRPC versions support multiple grpc.StatsHandler() options - each handler is added to an internal list and all are invoked on RPC events. The current implementation correctly registers all telemetry handlers.

// All handlers are registered and invoked
for _, handler := range handlers {
    if handler != nil {
        options = append(options, grpc.StatsHandler(handler))
    }
}

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