Outbox PbeParameters and PbeEncryptionAlgorithm

[vcsjones]

To support the PQC out-boxed types's ability to expose APIs for encrypted PKCS#8, we need to provide PbeParameters and PbeEncryptionAlgorithm to down level targets as well.

Fixes #113952

[Copilot]

Pull Request Overview

This PR removes the existing implementations of PbeParameters and PbeEncryptionAlgorithm from multiple locations and introduces common implementations to support encrypted PKCS#8 for downlevel targets while updating type-forwarding and shim definitions accordingly.

• Removed duplicated implementations from System.Security.Cryptography and Microsoft.Bcl.Cryptography.
• Added new implementations under the Common folder.
• Updated type forwarding and shim conditions to expose the new common types for NET and NETSTANDARD2_1_OR_GREATER.

Reviewed Changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/libraries/System.Security.Cryptography/PbeParameters.cs	Removed legacy implementation to avoid duplication
src/libraries/System.Security.Cryptography/PbeEncryptionAlgorithm.cs	Removed legacy implementation to avoid duplication
src/libraries/Microsoft.Bcl.Cryptography/PbeParameters.netstandard.cs	Removed legacy implementation
src/libraries/Microsoft.Bcl.Cryptography/PbeEncryptionAlgorithm.netstandard.cs	Removed legacy implementation
src/libraries/Microsoft.Bcl.Cryptography/NetStandardShims.cs	Added conditional directives to support netstandard requirements
src/libraries/Microsoft.Bcl.Cryptography/Microsoft.Bcl.Cryptography.Forwards.cs	Updated type forwarding to include the new common types
src/libraries/Common/src/System/Security/Cryptography/PbeParameters.cs	Introduced common implementation for PbeParameters
src/libraries/Common/src/System/Security/Cryptography/PbeEncryptionAlgorithm.cs	Introduced common implementation for PbeEncryptionAlgorithm

Files not reviewed (2)

• src/libraries/Microsoft.Bcl.Cryptography/src/Microsoft.Bcl.Cryptography.csproj: Language not supported
• src/libraries/System.Security.Cryptography/src/System.Security.Cryptography.csproj: Language not supported

Comments suppressed due to low confidence (1)

src/libraries/Common/src/System/Security/Cryptography/PbeParameters.cs:60

• Consider adding unit tests to verify the iteration count validation logic and ensure that an ArgumentOutOfRangeException is thrown when iterationCount is less than 1.

ArgumentOutOfRangeException.ThrowIfNegativeOrZero(iterationCount);

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