feat: Add a ClientFactory.connect() method for easy client creation

[mikeas1]

Description

This PR adds a convenience method for constructing a Client from either an AgentCard URL or an AgentCard directly. The goal is to reduce the number of lines of code required for simple client creation, but still enabling more advanced handled of client construction.

Usage example:

my_agent_url = 'https://travel-agent.example.com' client = await ClientFactory.connect(my_agent_url) await client.send_message(...)

BEGIN_COMMIT_OVERRIDE
feat: Add a ClientFactory.connect() method for easy client creation
Release-As: 0.3.10
END_COMMIT_OVERRIDE

[gemini-code-assist]

Summary of Changes

Hello @mikeas1, 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 enhances the ClientFactory by adding a convenient connect class method. This method streamlines the process of creating client instances, allowing developers to quickly establish connections to agents by simply providing a URL or an AgentCard, thereby reducing boilerplate code and improving ease of use for common client setup patterns.

Highlights

• New ClientFactory.connect method: Introduced a new asynchronous class method connect to the ClientFactory for simplified client creation.
• Flexible Client Initialization: The connect method can now accept either an AgentCard URL (which it resolves internally) or a pre-existing AgentCard object.
• Configuration Options: The new connect method supports various client configuration parameters, including ClientConfig, consumers, interceptors, relative_card_path, resolver_http_kwargs, and extra_transports.
• Comprehensive Testing: Added extensive unit tests to cover various scenarios for the connect method, ensuring its robustness with different input types and configurations.

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[gemini-code-assist]

Code Review

This pull request introduces a convenient ClientFactory.connect method for easier client creation. The implementation is mostly solid and well-tested. However, I've found a bug where some parameters are ignored when an httpx_client is not provided, leading to inconsistent behavior. I've suggested a fix that also refactors the code for better readability and maintainability. I've also noted a test that will need to be updated along with the fix.