Followup to a2aproject/A2A#634

* feat: Update to support python 3.12

- add case statement to use the asyncio.Queue.shutdown method for 3.13+
- add special handling to allow for similar semantics as
  asyncio.Queue.shutdown for 3.12

Tested on multiple samples in the a2a repo and some examples in this
repo

* Change to 3.10 and provided detailed description about event queue usage

* Update birthday agent example with adk 1.0

* Fix field name for auth_config -> authConfig in calendar agent

* Update event_consumer.py

* Update event_consumer.py

* Introduce a ServerCallContext parameter

* Finish comment

* Remove Starlette-specific DefaultCallContextBuilder

* Update comment

* feat: Update to support python 3.12

- add case statement to use the asyncio.Queue.shutdown method for 3.13+
- add special handling to allow for similar semantics as
  asyncio.Queue.shutdown for 3.12

Tested on multiple samples in the a2a repo and some examples in this
repo

* Change to 3.10 and provided detailed description about event queue usage

* Fix race condition in python <= 3.12

* fix merge conflict

* Fix typo

* Add functionality for extended agent card. Does not support authentication yet

* Formatting

* Pass a default and an  extended card to the starlette app. Also add tests

* Address review comments

* Add docstring back and remove extra attribute not used anymore

* Use model_copy for specific_extended_agent_card

* return a 404 instead of public card from extended card EP

* eat any exception thrown during auth card get.

---------

Co-authored-by: Holt Skinner <13262395+holtskinner@users.noreply.github.com>
Co-authored-by: Holt Skinner <holtskinner@google.com>

…level required python version (#117)

* feat: Update to support python 3.12

- add case statement to use the asyncio.Queue.shutdown method for 3.13+
- add special handling to allow for similar semantics as
  asyncio.Queue.shutdown for 3.12

Tested on multiple samples in the a2a repo and some examples in this
repo

* Change to 3.10 and provided detailed description about event queue usage

* fix merge conflict

* Fix typo

* Update the examples for python < 3.13

* Start sketching out auth handling ideas

* Introduce simple server request auth structures

* Make ServerCallContext a pydantic model

* Update check-spelling metadata

* Fix broken tests

* Delete empty file

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Holt Skinner <13262395+holtskinner@users.noreply.github.com>