fix: generic constraint test

[GerardSmit]

No description provided.

[Copilot]

Pull request overview

This PR aims to fix generic constraint validation in the Mediator library and add support for .NET 10.0. The main changes include implementing proper generic constraint checking to ensure handlers with unsatisfied constraints are correctly skipped, optimizing handler lookup through caching, and updating target frameworks and package versions to support .NET 10.0.

Key changes:

• Adds GenericTypeHelper class with constraint validation logic using CLR's MakeGenericType for reliable constraint checking
• Implements caching of matching registrations to avoid repeated enumeration
• Updates all project files to target .NET 10.0 and updates package dependencies
• Adds comprehensive test coverage for various generic constraint scenarios

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
src/Mediator.DependencyInjection/Generic/Handlers/GenericTypeHelper.cs	New helper class for validating generic constraints and caching registrations
src/Mediator.DependencyInjection/Generic/Handlers/GenericNotificationHandler.cs	Adds constraint validation and caching to notification handler lookup
src/Mediator.DependencyInjection/Generic/Handlers/GenericRequestHandler.cs	Adds constraint validation and caching to request handler lookup
src/Mediator.DependencyInjection/Generic/Handlers/GenericStreamRequestHandler.cs	Adds constraint validation and caching to stream request handler lookup
src/Mediator.DependencyInjection/Generic/MediatorBuilder.NotificationHandler.cs	Fixes registration logic to check handler type instead of notification type
tests/Mediator.DependencyInjection.Tests/Generics/ConstraintValidationTest.cs	Comprehensive test suite for generic constraint validation across all handler types
tests/Mediator.DependencyInjection.Tests/Generics/NotificationGenericTest.cs	Additional tests for generic notification handler registration
tests/Mediator.DependencyInjection.Tests/Generics/RequestGenericTest.cs	Test for handler not found exception with generic type mismatch
Multiple .csproj files	Updates target frameworks to include net10.0
Multiple package references	Updates package versions for .NET 10.0 compatibility
Workflow files	Adds .NET 10.0 SDK to CI/CD pipelines

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