refactor: add RequestOptions to multitransport client

[ishymko]

Description

Propagate RequestOptions down to Transport.

Re #198, was missing in the original PR - wasn't release yet, so no impact.

[gemini-code-assist]

Summary of Changes

Hello @ishymko, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the MultitransportClient to enhance its flexibility by allowing RequestOptions to be passed through all relevant client methods to the underlying transport mechanism. This change ensures that custom request configurations can be applied consistently across various client operations, addressing a previously missed integration point without impacting existing functionality.

Highlights

• RequestOptions Propagation: The pull request introduces the propagation of RequestOptions down to the Transport layer within the MultitransportClient.
• Method Signature Updates: Several client methods, including sendMessage, sendMessageStream, and various task-related configuration methods, have been updated to accept an optional RequestOptions parameter.
• Underlying Transport Calls: The optional RequestOptions are now passed through to the corresponding methods of the underlying transport object, ensuring consistent request configuration.

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[gemini-code-assist]

Code Review

This pull request correctly refactors the Client class to propagate RequestOptions down to the transport layer by adding an optional options parameter to its public methods. The implementation is straightforward and consistent across the class. However, there are a couple of areas for improvement. Firstly, the JSDoc comments for the newly added options parameter are missing, which impacts code clarity and maintainability. Secondly, and more critically, the corresponding unit tests do not appear to have been updated to reflect the changes in method signatures. This is essential to ensure that the refactoring has not introduced any regressions.