Add polyfills for Queue<T>.TryDequeue(...) and Queue<T>.TryPeek(...)

[Tyrrrz]

No description provided.

[Copilot]

Pull request overview

This PR adds polyfill implementations for Queue<T>.TryDequeue(out T?) and Queue<T>.TryPeek(out T?) methods, which were introduced in .NET Core 2.0. These polyfills enable older frameworks (.NET Framework, .NET Core 1.x, and .NET Standard < 2.1) to use these convenient "Try" pattern methods that safely attempt to dequeue or peek at queue elements without throwing exceptions when the queue is empty.

Key changes:

• Added polyfill implementations for Queue<T>.TryDequeue and Queue<T>.TryPeek in PolyShim/NetCore20/Queue.cs
• Added comprehensive unit tests covering both success and failure scenarios
• Updated documentation to reflect the two new method signatures

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
PolyShim/NetCore20/Queue.cs	Implements polyfills for TryDequeue and TryPeek methods on Queue<T> using check-then-act pattern with Count property
PolyShim.Tests/NetCore20/QueueTests.cs	Adds comprehensive test coverage for both methods including empty queue, multiple elements, and peek-after-dequeue scenarios
PolyShim/Signatures.md	Updates total signature counts and adds documentation entries for the two new Queue methods

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (fff75c2) to head (1eab9e8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

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##   master   #48   +/-   ##
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