[Feature] Port SameAuthParamsLookupAutoClusterFailover from Java client to C++

## Motivation

The Java client introduced `SameAuthParamsLookupAutoClusterFailover` in apache/pulsar#23129 (merged August 2024, released in Pulsar 4.0.0 and backported to 3.0.7 / 3.3.2). This `ServiceUrlProvider` implementation addresses a well-known reliability gap in `AutoClusterFailover` that is particularly relevant to geo-replication deployments sitting behind a Pulsar Proxy.

**The problem with `AutoClusterFailover`**: its health probe is a raw TCP connection. In a typical deployment where a Pulsar Proxy fronts the brokers, the TCP probe succeeds as soon as the proxy accepts the connection — even if all brokers behind the proxy have crashed. This means `AutoClusterFailover` cannot detect broker-layer failure and may reconnect clients to a cluster that is not actually serving requests.

**What `SameAuthParamsLookupAutoClusterFailover` does differently**:
- Probes cluster health via a **topic lookup** (`getBroker()` on a configurable test topic) rather than a raw TCP connection. A broker that can respond to a lookup is demonstrably processing requests — the proxy cannot mask broker failure here.
- Introduces a **hysteresis state machine** with separate `failoverThreshold` and `recoverThreshold` counters (default 5 each), requiring consecutive failures before cutting over and consecutive successes before switching back. This prevents flapping without requiring a coarse `switchBackDelay` timer.
- Targets geo-replication topologies where all clusters share the same authentication credentials, which is the common case.

## Request

Port `SameAuthParamsLookupAutoClusterFailover` to the C++ client.

The `ServiceInfoProvider` interface is already part of the C++ public API (`include/pulsar/ServiceInfoProvider.h`), and `AutoClusterFailover` is already implemented against it — so the interface contract is defined and the pattern is established. The Java implementation ([`SameAuthParamsLookupAutoClusterFailover.java`](https://github.com/apache/pulsar/blob/master/pulsar-client/src/main/java/org/apache/pulsar/client/impl/SameAuthParamsLookupAutoClusterFailover.java)) serves as a direct reference.

## Impact

The C++ client is the foundation for the Node.js client binding. Once `SameAuthParamsLookupAutoClusterFailover` is available in C++, it can be surfaced to Node.js consumers as well — a client language that currently has no automatic failover support at all.

This would bring C++ and Node.js deployments to parity with Java on the most important `AutoClusterFailover` reliability fix for proxy-fronted geo-replication clusters.

## References

- apache/pulsar#23129 — original Java implementation and motivation
- `include/pulsar/ServiceInfoProvider.h` — existing C++ interface
- `lib/AutoClusterFailover.cc` — existing C++ `AutoClusterFailover` implementation (reference for structure)

Commencez par lib/AutoClusterFailover.cc et include/pulsar/ServiceInfoProvider.h afin de comprendre la structure C++ existante et le contrat de l’interface, puis comparez-les avec SameAuthParamsLookupAutoClusterFailover.java. La tâche est terminée lorsque le client C++ fournit le sondage de santé demandé pour la recherche de topics, des seuils distincts pour le failover et la récupération, ainsi qu’un comportement partagé pour les paramètres d’authentification.

Rédigé par le modèle d'indexation à partir du texte de l'issue.