feat: DockerCommandLineCodeExecutor support for additional volume mounts, exposed host ports

[andrejpk]

Add the following additional configuration options to DockerCommandLineCodeExectutor:

• extra_volumes (Optional[Dict[str, Dict[str, str]]], optional): A dictionary of extra volumes (beyond the work_dir) to mount to the container. Defaults to None.
• extra_hosts (Optional[Dict[str, str]], optional): A dictionary of host mappings to add to the container. (See Docker docs on extra_hosts) Defaults to None.
• init_command (Optional[str], optional): A shell command to run before each shell operation execution. Defaults to None. 

Why are these changes needed?

See linked issue below.

In summary: Enable the agents to:

• work with a richer set of sys admin tools on top of code execution
• add support for a 'project' directory the agents can interact on that's accessible by bash tools and custom scripts

Related issue number

Closes #5363

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.11%. Comparing base (a9db384) to head (a452c7b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5383      +/-   ##
==========================================
+ Coverage   75.10%   75.11%   +0.01%     
==========================================
  Files         167      167              
  Lines        9906     9911       +5     
==========================================
+ Hits         7440     7445       +5     
  Misses       2466     2466              

Flag	Coverage Δ
unittests	75.11% <100.00%> (+0.01%)	⬆️

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