Create System roles by default

[Piedone]

Is your feature request related to a problem?

We have three default System roles coming from OrchardCore.Roles.Core, Anonymous, Authenticated, and Administrator (or a user-configured name for the same):

OrchardCore/src/OrchardCore/OrchardCore.Roles.Core/Services/DefaultSystemRoleNameProvider.cs

Line 7 in 6322061

internal sealed class DefaultSystemRoleNameProvider : ISystemRoleNameProvider

Nevertheless, these roles need to be created for each site, with descriptions, usually from a setup recipe. This is repetition that if one uses something other than the built-in recipes, one also has to continue in custom recipes.

Describe the solution you'd like

Pre-create the three roles, e.g. from the OrchardCore.Roles module, with their default descriptions, and remove them from the built-in recipes.

Describe alternatives you've considered

Having something explicit, like a recipe command or some IServiceCollection extension, that would create these roles. However, since the System roles are already a default (and well, System ones, important ones), I'd rather create them already.

If one wants to override their descriptions, or in case of Anonymous and Authenticated, their permissions, they'll still be able to in much the same way, also from setup recipes.