Resolve clients from KeyedServices

[Alirexaa]

What would you like to be added:
We already support resolving clients from ServiceProvider in some packages.
For example, we did this in the Elasticsearch package:

AspNetCore.Diagnostics.HealthChecks/src/HealthChecks.Elasticsearch/DependencyInjection/ElasticsearchHealthCheckBuilderExtensions.cs

Lines 98 to 105 in 65ab619

	public static IHealthChecksBuilder AddElasticsearch(
	this IHealthChecksBuilder builder,
	Func<IServiceProvider, Elastic.Clients.Elasticsearch.ElasticsearchClient>? clientFactory = null,
	string? name = default,
	HealthStatus? failureStatus = default,
	IEnumerable<string>? tags = default,
	TimeSpan? timeout = default)
	{

I strongly suggest supporting resolving clients from KeyedServices.

For instance, in the Elasticsearch package it would be something like this:

+ public static IHealthChecksBuilder AddKeyedElasticsearch(this IHealthChecksBuilder builder, object keyServiceName, string? name = default, HealthStatus? failureStatus = default, IEnumerable<string>? tags = default, TimeSpan? timeout = default);

Why is this needed:

Some users use AddKeyedService to register clients, so if the user wants to use the same client in the health check he or she should do more work to reach this goal.

We should support this kind of registration in our packages.

cc @adamsitnik @unaizorrilla