Startup Async Initializers on Tenant Container created.

[jtkech]

Useful to init any Tenant Singleton Service in an async way when a tenant container is built.

Without having to define and register another service as this is integrated by the system.

But by defining in any module startup an InitializeServicesAsync(IServiceProvider serviceProvider).

Or by using the new OCBuilder helper builder.InitializeServices(async serviceProvider => ....

In this PR we use the new OCBuilder extension helper to init the YesSql IStore.

builder.ConfigureServices(services =>
{
    services.AddScoped<IDbConnectionValidator, DbConnectionValidator>();
    ...
    // Configuring data access
    services.AddSingleton(sp =>
    {
        ...
        var store = StoreFactory.Create(storeConfiguration);
        ...
    });
    ...
})
.InitializeServices(async serviceProvider =>
{
    var store = serviceProvider.GetService<IStore>();
    if (store == null)
    {
        return;
    }

    await store.InitializeAsync();

    ...
});

Note: The usage of the OCBuilder helper allows to do this kind of thing from the web application.

[sebastienros]

The name doesn't make it easy to understand what it does and when it's called.

[jtkech]

@sebastienros

I'm open to any name ;) It is executed when a shell container is built, so after all ConfigureServices() and of course before all Configure()used to build the tenant pipeline. It allows to init some services in an async way, here I use it to initialize the IStore, see my 1st comment #13169 (comment)

.InitializeServices(async serviceProvider =>
{
    var store = serviceProvider.GetService<IStore>();
    if (store == null)
    {
        return;
    }

    await store.InitializeAsync();

    ...
});