Support Host.CreateApplicationBuilder with an IServiceCollection extension

[kmgallahan]

There is a new Host.CreateApplicationBuilder method that appears to be preferred over Host.CreateDefaultBuilder.

Per the .NET runtime team:

We moved away from the ceremony of a generic host in the default templates and to the scenario specific WebApplicationBuilder. The general idea was to move away from calbacks and move to linear code for configuring everything, this was part of .NET 6. In .NET 7, we added var builder = Host.CreateApplicationBuilder() as the backbone of WebApplication.CreateBuilder so we could have a smoother integration of the API styles (building the linear API on top of the callback API was error prone).

https://github.com/dotnet/runtime/discussions/81090#discussioncomment-4784551

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Serilog handled this by adding a UseSerilog extension method for IServiceCollection and updating the IHostBuilder extension implementation to use it:

https://github.com/serilog/serilog/issues/1855

https://github.com/serilog/serilog-extensions-hosting/pull/70

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Note Host.CreateApplicationBuilder is only available from .NET 7+

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[hadashiA]

MessagePipe provides the extensions to IServiceCollection and does not depend on IHostBuilder.

So the following is valid.

var builder = Host.CreateApplicationBuilder();
builder.Services.AddMessagePipe();

What exactly does "support" mean ?