[BUG] EvaluationContext is not added with OpenFeatureBuilder

[kylejuliandev]

Observed behavior

Calling OpenFeatureBuilder.AddContext() after you have added any providers causes the EvaluationContext to not be injected into the Api instance.

Expected Behavior

Calling OpenFeatureBuilder.AddContext() any place on the builder should add the EvaluationContext to the Api.

Steps to reproduce

Example code:

builder.Services.AddOpenFeature(featureBuilder =>
{
    featureBuilder
        .AddHostedFeatureLifecycle()
        .AddInMemoryProvider("InMemory", _ => new Dictionary<string, Flag>()
        {
            {
                "welcome-message", new Flag<bool>(
                    new Dictionary<string, bool> { { "show", true }, { "hide", false } }, "show")
            }
        })
        .AddContext(ctx => ctx.Set("region", "euw"));
});

Recording of the bug in action using a LoggingHook to read out the injected EvaluationContext.

no-evaluation-context-added.mp4

[kylejuliandev]

Fix should be ported in to #531