Add application level Python audit logging

[jamesbursa]

Ticket

None

Changes

• Add module api.logging.audit that implements Python audit logging.
• Add module api.util.collections.dict with class LeastRecentlyUsedDict.

Context for reviewers

Python has an audit events feature. This code uses the feature to log audit events, which can be useful for security analysis.

The logs have a custom logging level AUDIT.

Testing

A selection of logs when the server starts, include file opens, socket operations, and subprocess start:

[zelgadis]

LGTM! Made a few suggestions / nits, but nothing blocking 👍

[zelgadis]

should this file be named least_recently_used_dict.py?

[zelgadis]

And in app/api/util/collections/__init__.py we can do:

from .least_recently_used_dict import LeastRecentlyUsedDict

And to use it:

from api.util.collections import LeastRecentlyUsedDict

LeastRecentlyUsedDict(maxsize=4)

Which I think is a little cleaner than:

from api.util.collections.dict import dict_util

dict_util.LeastRecentlyUsedDict(maxsize=4)

[jamesbursa]

Used the name dict as this could contain other dict related utilities in future. I added the import to __init__.py.