Add useful services to IToolbarConfigurationContext and MenuConfigurationContext

[hikalkan]

There are some common operations, like checking permissions and localizing strings, are frequently done in these kind of contributors.
We can design shortcuts on these contexts.

Example:

public class ChatToolbarContributor : IToolbarContributor
{
    public async Task ConfigureToolbarAsync(IToolbarConfigurationContext context)
    {
        if (context.Toolbar.Name == StandardToolbars.Main)
        {
            var authorizationService = context.ServiceProvider
                .GetRequiredService<IAuthorizationService>();

            if (await authorizationService.IsGrantedAsync(ChatPermissions.Messaging))
            {
                context.Toolbar.Items
                    .Insert(0, new ToolbarItem(typeof(MessagesToolbarItemViewComponent)));
            }
        }
    }
}

Can be written easier if we have a context.IsGrantedAsync method. We should resolve these services as lazy.