HostApplicationBuilder Extension Support

[RyanThomas73]

Feature Request

Currently the webjobs SDK only provides extensions to configure webjob services against the older IHostBuilder types.
Support should be added for configuring the webjobs against the newer IHostApplicationBuilder type as well to ensure developers can leverage that latest .NET features and development practices.

Related information

Current WebJobHostBuilderExtensions Source Location

The HostApplicationBuilder Documentation Page

The Related Host.CreateApplicationBuilder Documenation Page

See also this comment from the dotnet runtime repository regarding the plans for switching to the newer application builder signatures

Minimal Implementation Example

public static IWebJobsBuilder ConfigureWebJobs(
    this IHostApplicationBuilder builder)
    => ConfigureWebJobs(builder, static jobHostOptions => { });
    
public static IWebJobsBuilder ConfigureWebJobs(
    this IHostApplicationBuilder builder,
    Action<JobHostOptions> configure)
{
    builder.Configuration.TryAddDefaultConfigurationSources();

    var webJobsBuilder = builder.Services.AddWebJobs(configure);
    builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IHostedService, JobHostService>());

    return webJobsBuilder;
}

[divyeshio]

Stumbled up on this issue when I tried to use current hosting model, quite surprised as it's been more than 2 years since HostApplicationBuilder has been implemented here, but hasn't come through to webjobs sdk yet. Will try to contribute for it.