feat: add AddHandler extension method to Dependency Injection package

[kylejuliandev]

This PR

• Introduces a new extension method in the OpenFeature.DependencyInjection package which allows consumers to add, at a global/api level, a handler.

Example usage:

builder.Services.AddOpenFeature(feature =>
{
    feature.AddHostedFeatureLifecycle()
        .AddInMemoryProvider()
        .AddHandler(ProviderEventTypes.ProviderReady, (@event) => { Console.WriteLine("{0}", @event!.ProviderName); })
        .AddHandler(ProviderEventTypes.ProviderReady, sp => (@event) =>
        {
            var logger = sp.GetRequiredService<ILogger<Program>>();
            logger.LogInformation("Provider Ready");
        });
});

Related Issues

Fixes #457

Notes

Follow-up Tasks

How to test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.87%. Comparing base (0a5ab0c) to head (51645c2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #462      +/-   ##
==========================================
+ Coverage   86.72%   86.87%   +0.14%     
==========================================
  Files          42       43       +1     
  Lines        1703     1722      +19     
  Branches      179      180       +1     
==========================================
+ Hits         1477     1496      +19     
  Misses        187      187              
  Partials       39       39              

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[beeme1mr]

Looks good to me. I just had a question about the random name generator but it isn't a blocker.

[askpt]

Looks good to me. Great work. Added a couple of suggestions 👍

[askpt]

It is a very minor request! We should also validate for inputs like whitespace.

Also, @arttonoyan, would you mind double-checking?

[askpt]

LGTM. Just a minor question, and should be ready to merge! Thanks!

[askpt]

LGTM! If @arttonoyan is happy with the changes @kylejuliandev made, we can merge it 👍
Thanks for your efforts!