Added support for using IServiceProvider when configuring Rabbitmq

[isdaniel]

What this PR does / why we need it:

This pull request is supported for configuring the connection and option using an IServiceProvider similar to how the SqlServerHealthCheck supports this for a connection string & Uri.

So instead of this:

var provider = services.BuildServiceProvider();
var settings = services.GetRequiredService<IOptions>();

We need to set string type for Rabbitmq connection from heartbeat before.

services.AddHealthChecks().AddRabbitMQ("Connectionstring");

You can now do something like the code below.

//for connection string
services.AddHealthChecks().AddRabbitMQ(sp => services.GetRequiredService<IOptions>().Value.RabbitmqConnectionString);

//for uri string
services.AddHealthChecks().AddRabbitMQ(sp => services.GetRequiredService<IOptions>().Value.RabbitmqConnectionString);

Special notes for your reviewer:

This is based on the connectionStringFactory implementation in the SqlServerHealthCheck.

I had added some unit tests & functional tests for this feature, I passed by this picture below

Does this PR introduce a user-facing change?:

Please make sure you've completed the relevant tasks for this PR, out of the following list:

It extends but does not break the existing options for configuring a RabbitMQ HealthCheck

• Code compiles correctly
• Created/updated tests
• Unit tests passing
• End-to-end tests passing
• Extended the documentation
• Provided sample for the feature

[sungam3r]

@isdaniel I merged #912 and #913 that affect your PR. Please rebase it onto master.

[isdaniel]

@sungam3r I had edited my PR & tried to rebase onto master, I seldom do rebase I am not sure that is correct