feat: Add agent card as a route in rest adapter

[rajeshvelicheti]

BEGIN_COMMIT_OVERRIDE
feat: Add agent card as a route in rest adapter

Release-As: 0.3.1
END_COMMIT_OVERRIDE

[gemini-code-assist]

Summary of Changes

Hello @rajeshvelicheti, 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!

I've implemented changes to the REST adapter to expose the agent card via a new dedicated endpoint. My primary goal was to ensure that the agent card is always accessible through a consistent route, with the logic for determining whether to serve a public or authenticated version of the card now encapsulated within the handler method itself. This simplifies the route registration process and centralizes the card serving logic.

Highlights

• New Agent Card Route: I've added a new GET route, '/v1/card', to the REST adapter. This endpoint will now serve the agent card information.
• Agent Card Handling Logic Refinement: I've refactored the logic for serving the agent card. Previously, the '/v1/card' route was conditionally registered. Now, the route is always registered to handle_get_agent_card, and the decision to serve a public or authenticated extended card is handled within the handle_get_agent_card method itself, based on whether 'self.agent_card.supports_authenticated_extended_card' is true.

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[gemini-code-assist]

Code Review

This pull request correctly adds the /v1/card route to the REST adapter and centralizes the logic for serving the agent card. This is a good improvement as it fixes an issue where the agent card route might not have been available if authenticated cards were not supported. I've left one minor comment regarding code style consistency.