Command line code sanitation

[AaronWard]

This update is a security enhancement for LocalCommandlineCodeExecutor to mitigate the risk of executing potentially harmful commands that could lead to unintended consequences such as data loss or system compromise. This utility aims to enhance security by preventing commands like rm -rf /, direct writes to /dev/sda, and execution of fork bombs (to name a few). Context of a discussion in PR: #1405 (review).

Updates and Changes

• Added the CommandSanitizer utility class to code_utils.py, designed to inspect code blocks for patterns associated with dangerous commands before execution.
• Updated LocalCommandlineCodeExecutor to include the use of CommandSanitizer
• Added tests for CommandSanitizer to validate the effectiveness of the sanitation process.
• Renamed test/test_code.py to test/test_code_utils.py

Why are these changes needed?

• needed as we cant trust that an agent won't generate dangerous commands (which is probably a higher risk when using open source LLMs)
• if someone was to opt to not user docker, these command could affect the user's machine
• Relevant to [Roadmap] Code Execution and User-Defined Functions #1421

Related issue number

#1405 (review)

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

All modified and coverable lines are covered by tests ✅

Comparison is base (5aee911) 39.12% compared to head (ae63f8f) 51.06%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1627       +/-   ##
===========================================
+ Coverage   39.12%   51.06%   +11.94%     
===========================================
  Files          57       57               
  Lines        6073     6082        +9     
  Branches     1360     1482      +122     
===========================================
+ Hits         2376     3106      +730     
+ Misses       3502     2726      -776     
- Partials      195      250       +55     

Flag	Coverage Δ
unittests	50.98% <100.00%> (+11.86%)	⬆️

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