Add new poe command and script for heavier integration testing

[gagb]

This pull request includes the addition of an integration test task to the pyproject.toml file and a new script for running integration tests.

Integration test addition:

• python/packages/autogen-agentchat/pyproject.toml: Added a new integration test task under [tool.poe.tasks] to run sh run-integ-test.sh.

New integration test script:

• python/packages/autogen-agentchat/run-integ-test.sh: Created a new script that currently outputs "Hello World".

User can run integration tests using the following command in the agent chat package:

poe integ-test

[afourney]

Looks awesome Gagan. I'll add some end-to-end tests ASAP, and then we can mark as ready to review.

[jackgerrits]

Let's revisit this when we have integration tests in place