Add Endpoint property to HttpContext and DefaultHttpContext

[onurkanbakirci]

Fixes #50522

This PR introduces a new HttpContext.Endpoint property, providing direct access to the selected Endpoint associated with the current request.

[Copilot]

Pull Request Overview

This PR adds a new Endpoint property to the HttpContext abstract class and implements it in DefaultHttpContext, providing direct access to the current request's endpoint without requiring extension methods.

• Added abstract Endpoint property to HttpContext base class with comprehensive XML documentation
• Implemented the property in DefaultHttpContext using existing extension methods for consistency
• Updated debug view to use the new property instead of extension method
• Added comprehensive test coverage for the new property

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/Http/Http.Abstractions/src/HttpContext.cs	Added abstract Endpoint property with XML documentation and updated debug view
src/Http/Http/src/DefaultHttpContext.cs	Implemented Endpoint property using existing GetEndpoint() and SetEndpoint() extension methods
src/Http/Http.Abstractions/test/EndpointHttpContextExtensionsTests.cs	Added comprehensive test coverage for the new property behavior
src/Http/Http.Abstractions/src/PublicAPI.Unshipped.txt	Added public API entries for the new property getter and setter

[Copilot]

The braces should be placed on separate lines according to the .editorconfig formatting guidelines. The getter and setter should be formatted as:\ncsharp\nget\n{\n return this.GetEndpoint();\n}\nset\n{\n this.SetEndpoint(value);\n}\n

[dotnet-policy-service]

Looks like this PR hasn't been active for some time and the codebase could have been changed in the meantime.
To make sure no conflicting changes have occurred, please rerun validation before merging. You can do this by leaving an /azp run comment here (requires commit rights), or by simply closing and reopening.