feat: upgrade Confix to .NET 10 - #188

The using directive for 'Confix.Extensions' appeared previously in this namespace

Non-nullable property 'ReferenceResolver' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Possible null reference assignment.

Possible null reference assignment.

Possible null reference argument for parameter 'source' in 'IEnumerable<EvaluationResults> Enumerable.Where<EvaluationResults>(IEnumerable<EvaluationResults> source, Func<EvaluationResults, bool> predicate)'.

Non-nullable property 'ContextData' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'ContextData' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Nullability of reference types in type of parameter 'instance' of 'bool FeatureCollection.TryGet<TFeature>(out TFeature instance)' doesn't match implicitly implemented member 'bool IFeatureCollection.TryGet<TFeature>(out TFeature? instance)' (possibly because of nullability attributes).

Nullability of type of parameter 'type' doesn't match overridden member (possibly because of nullability attributes).