[CHA-2595] add jwt token helper

[mogita]

No description provided.

[Copilot]

Pull request overview

This PR adds a CreateUserToken public method to the BaseClient class that allows consumers to generate a signed JWT token for a specific user ID (with an optional custom expiration). It also adds a corresponding unit test file to verify correct claim embedding, default/custom expiration, signature validity, and per-user uniqueness. This fits into the broader SDK pattern of providing token-helper utilities alongside the existing GenerateServerSideToken method.

Changes:

• New CreateUserToken(string userId, TimeSpan? expiration = null) public method added to BaseClient in src/Client.cs
• Pre-existing GenerateServerSideToken refactored to remove the commented-out claims
• New tests/CreateUserTokenTests.cs with 5 unit tests covering CreateUserToken behavior

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
src/Client.cs	Adds the CreateUserToken public method with XML documentation; cleans up the old commented-out claims in GenerateServerSideToken
tests/CreateUserTokenTests.cs	New unit test class covering user ID claims, default/custom expiration, signature validity, and different-user token uniqueness

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