Stride.HostBuilder

Is your feature request related to a problem? Please describe.
Create HostBuilder for stride core.
With this feature in Program.cs you will have configuration pipeline of how stride will perform.
Its cool bc you can run background services if you need. run multiple instances of core. Configure things in fluent style.

Describe the solution you'd like
Look at Microsoft.Hosting. Made simmilar thing or use just it with some tweaks.

Here are some questions that can aid in the description of the feature request:

What are the usecases?

• Server builds. Easier using of codefirst approach. Easier configuring app from Program.cs. Game logic can be embeded as HostedService.

What kind of options/settings are expected/wanted?

• Basic things like UseAssetPath. DI AddWindowing UseRenderer(/*renderer type*/) etc. endless usecases (extension methods r welcome)

What would the (pseudo) code look like?
Like MAUI configuring. You has Core where you configure app. Then you build it and return host.
In platform specific project you run that host
Is the feature affecting behaviour in the editor?

• no

Is there a component or datastructure?

• architecture

what kind of documentation is needed or needs to be updated?

• written new docs

Should there be an example project?

• no. docs will be enough

Start by reviewing Microsoft.Hosting and the existing Program.cs and platform-specific startup paths mentioned in the request. Define the HostBuilder architecture and its configuration options, including asset paths, dependency injection, windowing, rendering, and hosted services; done means the core can build and run the configured host with accompanying documentation.