[Feat]: allow async extended card modifier

[cbugwadia32]

Is your feature request related to a problem? Please describe.

We'd like to be able to modify the authenticated agent card based on data we fetch via an HTTP request. That request uses async, so right now we are unable to use an extended agent card modifier to do the job (since we'd need to block on the async call and thus block the entire server).

Describe the solution you'd like

extended_card_modifier should be an async method, and inside of handle_authenticated_agent_card it should be called with await. This way we can make async calls inside of the extended card modifier.

Describe alternatives you've considered

Our alternative is to extend the application class and the adapter class so that we have a custom adapter and implementation of the handle_authenticated_agent_card method. This is quite cumbersome and not very future proof.

Additional context

N/A

Code of Conduct

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[ryanaiagent]

Hi @cbugwadia32 , Thanks for the detailed feature request. We'll review this internally and get back to you with an update on its implementation status.