`Guard.IsReferenceEqualTo` should accept `T?`

[AlgorithmsAreCool]

Describe the bug

Currently it seems that Guard.IsReferenceEqualTo requires the parameters to be non-null. I believe the signature should be changed to permit nullable types because I believe that comparison to null values is a reasonable expectation and it is supported by the underlying call to object.ReferenceEquals

Regression

No response

Steps to reproduce

object x = null;
object y = new Object();

Guard.IsReferenceEqualTo(x,y); //produces CS8634

Expected behavior

No CS8634

Screenshots

No response

IDE and version

VS 2022 Preview

IDE version

No response

Nuget packages

• [ ] CommunityToolkit.Common
• [ ] CommunityToolkit.Diagnostics
• [ ] CommunityToolkit.HighPerformance
• [ ] CommunityToolkit.Mvvm (aka MVVM Toolkit)

Nuget package version(s)

8.2.2

Additional context

No response

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