Filter types by CustomHandler generic constraints

[Dreamescaper]

Fixes #46 .

[Copilot]

Pull Request Overview

This PR adds support for filtering types based on generic constraints defined on CustomHandler methods. When a CustomHandler method is generic, types are now automatically validated against the constraints (such as class, struct, new(), and interface constraints) before being passed to the handler.

Key changes:

• Version bumped from 2.3 to 2.4
• Added constraint validation logic in the source generator
• Added comprehensive test coverage for various constraint scenarios

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
version.json	Bumped version from 2.3 to 2.4
ServiceScan.SourceGenerator/DependencyInjectionGenerator.FilterTypes.cs	Implemented generic constraint validation logic with support for reference/value type constraints, constructor constraints, and nested type parameter constraints
ServiceScan.SourceGenerator.Tests/CustomHandlerTests.cs	Added six test cases covering different constraint scenarios (new(), class, nested type parameters, multiple interfaces, struct, and combined constraints)
README.md	Updated documentation to clarify that CustomHandler methods with generic constraints automatically filter types

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[Copilot]

Pull Request Overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

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