Add polyfills for File.ReadLinesAsync(...), TextReader.ReadLineAsync(CancellationToken), TextReader.ReadToEndAsync(CancellationToken)

[Tyrrrz]

No description provided.

[Copilot]

Pull request overview

This PR adds polyfills for three .NET 7.0 APIs related to asynchronous file and text reading operations with cancellation token support: File.ReadLinesAsync, TextReader.ReadLineAsync(CancellationToken), and TextReader.ReadToEndAsync(CancellationToken).

• Implements TextReader.ReadLineAsync(CancellationToken) and TextReader.ReadToEndAsync(CancellationToken) polyfills for frameworks prior to .NET 7.0
• Adds two overloads of File.ReadLinesAsync that return IAsyncEnumerable<string> with cancellation support
• Includes comprehensive test coverage for the new polyfills including cancellation scenarios

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
PolyShim/Signatures.md	Updates signature counts and documentation to reflect 4 new polyfilled members
PolyShim/Net70/TextReader.cs	Implements ReadLineAsync(CancellationToken) and ReadToEndAsync(CancellationToken) polyfills
PolyShim/Net70/File.cs	Implements two ReadLinesAsync overloads with async enumerable return type
PolyShim.Tests/Net70/TextReaderTests.cs	Adds tests for TextReader polyfills including cancellation scenarios
PolyShim.Tests/Net70/FileTests.cs	Adds basic test for File.ReadLinesAsync functionality

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (7ee686f) to head (2633619).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

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