Add NonCryptographicHashAlgorithm Clone methods

[stephentoub]

Closes #111908

[dotnet-issue-labeler]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

[dotnet-issue-labeler]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

[Copilot]

PR Overview

This PR introduces Clone methods to NonCryptographicHashAlgorithm and its implementations so that an algorithm’s internal state can be duplicated.

• Adds new abstract member Clone in the test driver and updates derived tests.
• Implements Clone methods in XxHash64, XxHash32, Crc64, Crc32, XxHash128, and XxHash3.
• Updates reference assemblies to reflect the new Clone API.

Reviewed Changes

File	Description
System.IO.Hashing/tests/NonCryptoHashTestDriver.cs	Adds abstract Clone member and corresponding test to validate cloning behavior.
System.IO.Hashing/tests/XxHashTests.cs, CrcTests.cs	Adds tests ensuring that cloned instances produce identical hash sequences.
System.IO.Hashing/src/System/IO/Hashing/*.cs	Implements Clone methods for various hash algorithms.
System.IO.Hashing/ref/System.IO.Hashing.cs	Updates public API definitions to include the new Clone methods.

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