Add `--file-based` option for relevant templates

We should consider updating the following `dotnet new` templates with a new `--file-based` option that creates them as file-based apps. This option would be configured to not be shown in Visual Studio as it doesn't support file-based apps.

- `console`
- `web` (empty web)
- `webapiaot` (web API w/ native AOT)

These templates are simple enough that it's reasonable to offer a file-based apps option for them.

The console template is of course super simple (one *appname.cs* file, one line of code), but the web templates would include an *appname.run.json* file and *appname.settings.json*/*appname.settings.Development.json* files which is handy.