Use jupyer-kernel-gateway for ipython executor

[jackgerrits]

Why are these changes needed?

This uses the jupyter-kernel-gateway to manage kernels for the ipython based executor. This is desirable as it allows us to have a common interface to interact with kernels irrespective of where they are executing. In this PR I migrate the embedded executor. I will follow this up with a docker container based version.

Related issue number

#1421

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 13.86139% with 261 lines in your changes are missing coverage. Please review.

Project coverage is 47.95%. Comparing base (ac15996) to head (4543624).

Files	Patch %	Lines
autogen/coding/jupyter/jupyter_client.py	10.09%	95 Missing and 3 partials ⚠️
autogen/coding/jupyter_code_executor.py	12.37%	85 Missing ⚠️
autogen/coding/jupyter/local_jupyter_server.py	0.00%	69 Missing and 1 partial ⚠️
autogen/coding/factory.py	0.00%	2 Missing and 1 partial ⚠️
autogen/coding/embedded_ipython_code_executor.py	60.00%	2 Missing ⚠️
autogen/coding/jupyter/__init__.py	50.00%	2 Missing ⚠️
autogen/coding/jupyter/base.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1748      +/-   ##
==========================================
+ Coverage   39.13%   47.95%   +8.82%     
==========================================
  Files          57       62       +5     
  Lines        6174     6473     +299     
  Branches     1384     1554     +170     
==========================================
+ Hits         2416     3104     +688     
+ Misses       3564     3118     -446     
- Partials      194      251      +57     

Flag	Coverage Δ
unittests	47.87% <13.86%> (+8.74%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jackgerrits]

Most of these change should be covered by the existing tests - but I don't think they are running since the dependencies are missing on the build machines

[ekzhu]

Just a nit. Approved. Let's open an issue to track the upstream bug fix to the jupyter gateway client.

[jackgerrits]

Upstream bug fix being tracked here #1763

[gagb]

I am very confused how this PR affects me as an end user? Can you please provide examples.

[jackgerrits]

This is part of a larger whole (including a docker based jupyter server), examples and docs will come with a later PR in the series

[gagb]

This PR works. Lets improve the syntax of updating system messages via introductions in a different PR.