Add callback to global_config to allow tracking of one's own SDK usage

[haakonvt]

DRAFT

Ref. edm-pipeline debug discussion: @spex66 @thorkildcognite

Checklist:

• Tests added/updated.
• Documentation updated. Documentation is generated from docstrings - these must be updated according to your change.
  If a new method has been added it should be referenced in cognite.rst in order to generate docs based on its docstring.
• Changelog updated in CHANGELOG.md.
• Version bumped. If triggering a new release is desired, bump the version number in _version.py and pyproject.toml per semantic versioning.

[spex66]

Not run it yet, but expected code consolidating counters across threads/processes?

Or does it require handling concurrency on callback side?

Parallelism still confuses me every time :)

[haakonvt]

Accidentally clicked close... 👀

[haakonvt]

Not run it yet, but expected code consolidating counters across threads/processes?

@spex66 The callback will be called by the different threads executing the requests (the SDK only uses threading as a means of concurrency). In the two examples given in the docstring, they would all write to the same object, which is totally fine (GIL + ordering doesn't matter).

Do you have a usage pattern in mind that you're afraid might have a race condition?

[haakonvt]

@spex66 do you need this feature or should we put it on hold?

[spex66]

Ok hold pls, and I need to set a reminder to look into it .. later