Add support for Microsoft.Extensions.DependencyInjection.Abstractions

[pdeffendol]

Make it easier to set up with .NET applications via Microsoft.Extensions.DependencyInjection.Abstractions extension methods.

[pdeffendol]

Something similar to EF, like:

builder.Services.AddObjectStorage(options =>
  options.UseGoogleCloudStorage(builder.Configuration.GetConnectionString("GCP")));

public class StuffService(IObjectStorage objectStorage)
{
    // ...
}

or if you need multiple buckets or providers, use keyed services in .NET 8:

builder.Services.AddKeyedObjectStorage("temp", options =>
  options.UseGoogleCloudStorage(builder.Configuration.GetConnectionString("temp_storage")));
builder.Services.AddKeyedObjectStorage("default", options =>
  options.UseGoogleCloudStorage(builder.Configuration.GetConnectionString("GCP")));