Add logging facility

[tintoy]

Create a DelegatingHandler that logs requests and responses (only added to the pipeline when an ILogger is supplied).

To implement this, we'll need to add support for specifying one or more DelegatingHandlers when creating a KubeApiClient.

Consider adding to KubeClientOptions?

public class KubeClientOptions
{
    /// <summary>
    ///     Factories for message handlers (if any) to be added to the HTTP request pipeline.
    /// </summary>
    public List<Func<DelegatingHandler>> MessageHandlers { get; } = new List<Func<DelegatingHandler>();
}

We can then implement an AddLogging extension method for KubeClientOptions which adds the required handler.

[tintoy]

Implemented.