Add Healthcheks endpoints to client

[Alirexaa]

Qdrant has three endpoint for checking server health status.

for more information see : https://qdrant.tech/documentation/guides/monitoring/#kubernetes-health-endpoints

We should have APIs for these endpoints in the client

API Proposal:

+ public Task<HealthResult> HealthAsync(TimeSpan? timeout = null,CancellationToken cancellationToken = default);

+ public Task<LiveResult> LiveAsync(TimeSpan? timeout = null,CancellationToken cancellationToken = default);

+ public Task<ReadyResult> ReadyAsync(TimeSpan? timeout = null,CancellationToken cancellationToken = default);