Add an option to auto-delete temp files created by LocalCommandLineExecutor

[afourney]

What feature would you like to be added?

LocalCommandLineExecutor leaves a lot of debris on disk like:

tmp_code_84c00a94989f5048ee254cb2e583fc8e75b66c0afef4a7a76c8901a4eb2f5bc5.py
tmp_code_95c44f5140612045a5fb8c5ccad956a2ae4afb4a028201cf836fbb55c09c72f1.py

These files are executed once, and never referred to again.

Please add an (on by default) option to automatically clean up temporary files.

Why is this needed?

Explained above.

[jackgerrits]

We don't need to do this work in the framework, using standard python tempdir tooling should work fine: https://github.com/microsoft/autogen/blob/prefix_sub/python/packages/autogen-core/tests/execution/test_commandline_code_executor.py#L92-L93