feat: Add DI for multi provider

[askpt]

Signed-off-by: André Silva 2493377+askpt@users.noreply.github.com

This PR

This pull request introduces dependency injection (DI) support for the MultiProvider in the OpenFeature .NET SDK, making it easier to configure and compose multiple feature flag providers using DI patterns. The main changes add new extension methods and builder classes to facilitate this integration, update sample usage, and provide comprehensive unit tests for the new functionality.

Dependency Injection Support for MultiProvider:

• Added a new FeatureBuilderExtensions class with AddMultiProvider extension methods, enabling the registration and configuration of MultiProvider via DI in OpenFeatureBuilder. This allows for flexible, code-based configuration of multiple providers and evaluation strategies.
• Introduced the MultiProviderBuilder class, which provides a fluent API for adding providers (by instance, factory, or type) and setting evaluation strategies, all with DI support.

Sample and Usage Updates:

• Updated the ASP.NET Core sample (Program.cs) to demonstrate the new DI-based MultiProvider configuration, including adding multiple providers, setting an evaluation strategy, and exposing an endpoint to test flag evaluation. [1] [2] [3]

Testing and Project References:

• Added comprehensive unit tests for MultiProviderBuilder, covering method chaining, provider addition, strategy configuration, and validation scenarios.
• Updated project references to include OpenFeature.Hosting where necessary to support the new DI functionality. [1] [2]

Related Issues

Fixes #549

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.25%. Comparing base (94fcdc1) to head (2656177).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

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##             main     #621      +/-   ##
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+ Coverage   89.89%   90.25%   +0.35%     
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  Files          77       79       +2     
  Lines        3168     3284     +116     
  Branches      364      384      +20     
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+ Hits         2848     2964     +116     
  Misses        251      251              
  Partials       69       69              

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[Copilot]

Pull Request Overview

This PR adds dependency injection (DI) support for the MultiProvider in the OpenFeature .NET SDK, enabling streamlined configuration of multiple feature flag providers through a fluent builder API.

Key Changes:

• Introduced MultiProviderBuilder class with fluent API for adding providers (by instance, factory, or type) and configuring evaluation strategies
• Added FeatureBuilderExtensions class with AddMultiProvider extension methods for registering MultiProvider via DI in OpenFeatureBuilder
• Updated ASP.NET Core sample to demonstrate DI-based MultiProvider configuration with multiple providers and evaluation strategy

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/OpenFeature.Providers.MultiProvider/DependencyInjection/FeatureBuilderExtensions.cs	Adds extension methods for configuring MultiProvider with OpenFeatureBuilder, supporting both default and domain-scoped registration
src/OpenFeature.Providers.MultiProvider/DependencyInjection/MultiProviderBuilder.cs	Implements fluent builder API for adding providers and configuring evaluation strategies with full DI support
test/OpenFeature.Providers.MultiProvider.Tests/DependencyInjection/MultiProviderDependencyInjectionTests.cs	Provides comprehensive unit tests for DI integration including null validation, provider registration, and domain support
test/OpenFeature.Providers.MultiProvider.Tests/DependencyInjection/MultiProviderBuilderTests.cs	Tests MultiProviderBuilder functionality including method chaining, provider addition, and strategy configuration
src/OpenFeature.Providers.MultiProvider/README.md	Documents DI-based setup with examples for adding providers, configuring strategies, and using named domains
samples/AspNetCore/Program.cs	Demonstrates DI-based MultiProvider configuration with multiple providers and FirstMatchStrategy
src/OpenFeature.Providers.MultiProvider/OpenFeature.Providers.MultiProvider.csproj	Adds project reference to OpenFeature.Hosting for DI support
test/OpenFeature.AotCompatibility/OpenFeature.AotCompatibility.csproj	Updates project reference from OpenFeature.DependencyInjection to OpenFeature.Hosting

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