Add debugging support

[jborean93]

Adds support for debugging playbooks using the ansibug library. This allows users to launch a debuggable playbook through this extension or attach to an existing playbook process launched by ansibug.

This requires https://github.com/jborean93/ansibug to be installed in the Python environment used by the extension. We need to have a conversation around whether this should be bundled with this extension or whether the user supplies it themselves. We could support both with the bundled version being a fallback. For now it just needs to be manually installed with

python -m pip install ansibug

Fixes: #760
Related: AAP-19811

[jborean93]

I think this PR is ready for a proper review. Please let me know what might be missing or needs to be fixed up so I can get it ready to be merged.

[priyamsahoo]

@jborean93, that's a significant and long-awaited feature to be added to the extension. Everything looks great to me. Could you also add some documentation that includes how to use this feature?

[ssbarnea]

Blocking this until the ansibug project status is clarified.

[ssbarnea]

@nitzmahone Considering the upcoming changes in core, please advise if we want to get this in as experimental and rewrite it once core changes get implemented. I do think that there is a lot of interest in playing with this feature.

[torsina]

not a lot of interest ???? use so many jinja template scripts that a debugger would be a lifesaver for me as we all know syntax errors for jinja are the opposite of useful, and ib general I want to know what the output of those script into playbook variables look like, so a ansible playbook debugger is an absolute necessity

and I'm not talking of a python debugger used to debug ansible somehow