Added factory service

[ebrob]

There are some use cases where an initializer isn't the best way to initialize.

[Arkobat]

I think it makes sense with a factory method, but we should probably use the IHttpClientFactory to create the client.

[Arkobat]

Looks good 👍
We should probably also inject the ILocalazyFactory when injecting the ILocalazyService
.AddScoped<ILocalazyFactory, LocalazyFactory>();

And add a unit tests that verifies we can use the LocalazyFactory.CreateService in practices

[ebrob]

@Arkobat I added a simple unit test that just ensures it can get the list of projects, so it works with my API key. Obviously I can't run your other tests since I don't have a key in your Localazy account.

[Arkobat]

That is perfect @ebrob
I just ran them locally, and it works as intended.